Network dies when I turn off 2g - G2 and Desire Z General

Anyone have this problem? It happens ever time
Sent from my T-Mobile G2 using XDA App

Hmm.... seems like your phone might be in WCDMA mode only... It should be in WCDMA-Preferred since you plan on using 3G and 2G
Go to your phone dialer and dial *#*#4636#*#*
and Diagnostics Menu should come up..... Go to PHONE INFORMATION.... Scroll down and Set Network Type to: WCDMA Preferred
see if that helps...

Thanks for the reply i am on tmobile and it is defaulted to GSM. Will changing it be any different than GSM?

my phone does that as well right now at home even though i have it on WCDMA preferred, t-mo has been having issues with their 4G towers and their DNS servers lately that has been affecting many people with newer phones/SIM cards and in 4G areas, t-mo has not released an ETA on a fix but i have been dealing with it for a month now at my home and i am about ready to switch carriers

tvdang7 said:
Thanks for the reply i am on tmobile and it is defaulted to GSM. Will changing it be any different than GSM?
Click to expand...
Click to collapse
Nope, it'll still be the same. WCDMA-Preferred means that then phone will Prioritize 3G/4G signal over an EDGE signal. So If you are in a decent 4G/3G coverage the phone will set itself into 3G/4G mode... and when you move into an area where you have a weaker 3G/4G signal...t han the phone will be in EDGE mode.

Keep in mind that if you're referring about using WCDMA Preferred in a 3G/4G coverage area - but only 2G works - then you have a network issue. This isn't so much a device issue as it is a MSISDN issue on the network or a potential tower issue.
If you get no signal on 3G/4G and signal is there on 2G - check your coverage first - then if coverage shows you should have 3G/4G, call TMO and let them know, they'll need to do a service request or trouble ticket based on the location and breadth of the issue you're having.

Related

T-mobile (USA) 3G

Hello, I am having trouble getting 3G working on my x10i. I have read through these forums and tried every apn settings I could find but still it only uses edge. T-mobile customer service tells me i have great 3g coverage in my area but that since its a non-tmobile phone it will not use 3G. Is this true or can anyone help? Right now im using epc.tmobile.com as my apn, data roaming on, and MMS & data turned on. Need more info just let me know.Thx for any help
check your sony ericsson xperia x10 box on the side, see if it said UMTS is saying "AWS1/AWS4/AWS8" if you are missing AWS4, then you will not be able to use T-mo USA 3G because T-mobile UMTS (3G) bandwidth frequency is 900 (AWS1) / 1700 (AWS4) / 2100 (AWS8)
i had a similar problem when my T-Mobile 3G constantly switched to Edge even when i had good coverage, i found this solution somewhere and it helped me, since then i was never dropped from 3G unless i had no bars... i would give this a try for your problem too.
1) enter in dialer the following: *#*#4636#*#*
2) select phone Information
3) press the menu button (left bottom hard key)
4) Select Radio Band
5) Select USA Band
6) Reboot Phone
This will narrow down your phone to USA 3G only, (if leaving the country you should switch back to automatic to get international 3G coverage), i found this also helpful for 3G speed and battery performance.
check your sony ericsson xperia x10 box on the side, see if it said UMTS is saying "AWS1/AWS4/AWS8" if you are missing AWS4, then you will not be able to use T-mo USA 3G because T-mobile UMTS (3G) bandwidth frequency is 900 (AWS1) / 1700 (AWS4) / 2100 (AWS8)
Click to expand...
Click to collapse
Thx for your replies , yes it says "UMTS/HSPA band 1/4/8" So should be possible.
1) enter in dialer the following: *#*#4636#*#*
2) select phone Information
3) press the menu button (left bottom hard key)
4) Select Radio Band
5) Select USA Band
6) Reboot Phone
This will narrow down your phone to USA 3G only, (if leaving the country you should switch back to automatic to get international 3G coverage), i found this also helpful for 3G speed and battery performance.
Click to expand...
Click to collapse
thx for your reply, I tried this and i still see the E for edge. Could it have something to do with the fact that where i live is actually using a different tower than tmobile?
thx for your reply, I tried this and i still see the E for edge. Could it have something to do with the fact that where i live is actually using a different tower than tmobile?
Click to expand...
Click to collapse
I doubt cause tmobile told you that your coverage is okay, it might be that you have an old sim card with no support for 3G, or Would say your phone is defective…
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Sent via the XDA Tapatalk App
try go to setting --->wireless controls --->Mobile Networks ----> Network mode
and select WCDMA only
see if it go back to 3G signal. For my area sometimes i stay on edge due to signal blocked by building walls....
by the way, will you get 3G signal when you are outside of your house or in a wide open area?
When i choose WCDMA i lose my cell signal completely. I have tmobile service but In my area it is always using centennial wireless towers for my signal, centennial was bought out by AT&T which have not yet switched their new towers to 3G yet. Could this be the problem? Thx
devilleather said:
When i choose WCDMA i lose my cell signal completely. I have tmobile service but In my area it is always using centennial wireless towers for my signal, centennial was bought out by AT&T which have not yet switched their new towers to 3G yet. Could this be the problem? Thx
Click to expand...
Click to collapse
Sounds like you found the issue. If WCDMA only shows no signal at all, it means you do not have T-Mobile 3G in your area (I suspect the 1700 spectrum).
It looks like there is a roaming agreement in which T-mobile can "borrow" the AT&T tower. So, all you get is the GSM signal. Don't bother to wait for AT&T to get the tower to 3G...because, you know, it won't be the same 3G signal as T-mobile. AT&T operates 3G on 850 and 1900.
If that is the issue, maybe you have to switch to a X10a.
When i choose US band it says its unsuccessful? any ideas why???

Phone keeps switching from 3G and HSPDA

I keep noticing the data status going from 3G and HSPDA every now and then even when I have full bars. This can't be good...
Anyone else experience this?
Is there a fix?
I also get the switching thing on my phone but only when the HSPA signal is weak and it's not that often. Is this affecting the battery life on your cell phone?
It's normal. If you have issues just set it to use 2g only mode as that saves a heap of power
Sent from my Apple Newton 2100
ickyboo said:
It's normal. If you have issues just set it to use 2g only mode as that saves a heap of power
Sent from my Apple Newton 2100
Click to expand...
Click to collapse
How do I set this? I checked in settings->wireless and network->mobile networks-> network mode, but see only an option for GSM only, WCDMA only.
If you're with Bell in Canada, there is no option for 2g only as there is no 2g network. Don't worry about the 3g/H switch, this is a common occurrence on most phones on most carriers. My GF's HTC Magic on Rogers did this too.
Gsm only is the 2g mode you want
Sent from my Apple Newton 2100
thanks! I see the option now.
GSM stands for 2G
HSPDA stands for 3G
when it changes between 2G/3G (G/H)[Automode] it's sort of Prefer 3G, fall back to 2G if 3G signal is weak.
you can easily change it off Settings > Wireless and Network > Mobile Network > Network Mode as you've said
actually my network doesnt support 2G (GSM). Like I said, it bounces between 3G and HSDPA (3.5G). Wonder what this does to battery life?
there is no problem, 3G is not as fast as HSPDA
in perfect reception you get 3.5G (HSPDA)
in not so good reception areas you get 3G
in very poor reception areas you are lucky to get 2G (EDGE)
ChiGGz said:
How do I set this? I checked in settings->wireless and network->mobile networks-> network mode, but see only an option for GSM only, WCDMA only.
Click to expand...
Click to collapse
wtf.. when i go to settings->wireless and network->mobile networks i see "data roaming" "access point names" and "network operators".
i have a bell vibrant unlocked and on rogers and id LOVE to force gsm only.. are you running the updated firmware or something?

Nexus S only shows 3G no H in Taiwan

On my news Nexus S I am only getting and showing 3G with poor connection whether I use Chung-Hwa Telecom or Taiwan's Far Eastone. On my HTC Desire when downloading or uploadinging it would show an "H" up on top and show "3G" if connection was not all that great but with this new Nexus S all I get is 3G. What's up with this? Reception is also worse than the HTC Desire.
Because nexus s only gets 3g
Sent from my Nexus S using XDA App
kjy112 said:
Because nexus s only gets 3g
Sent from my Nexus S using XDA App
Click to expand...
Click to collapse
Here I see it showing it gets HSDPA.. From what I understand is the 2100 Band in Taiwan is not just 3G
http://www.gsmarena.com/compare.php3?idPhone1=3620&idPhone2=3077
It gets HSDPA also, it just doesn't change icons like cyanogen or like the static H on the G2. It wasn't a widely used icon in america until the networks (T-mobbile and AT&T) upgraded to HSDPA or HSPA+.
It is capable of 7.2mbps download.
You could always check the status of the phone under settings to see what connection you have or wait until cyanogenmod comes out for the nexus s, not just the alpha version.
ya HSPA is still 3G with a max download speed of 7.2 HSPA+ depending on device ranges from like 14.4 to 42
KnightMAREcrow said:
It gets HSDPA also, it just doesn't change icons like cyanogen or like the static H on the G2. It wasn't a widely used icon in america until the networks (T-mobbile and AT&T) upgraded to HSDPA or HSPA+.
It is capable of 7.2mbps download.
You could always check the status of the phone under settings to see what connection you have or wait until cyanogenmod comes out for the nexus s, not just the alpha version.
Click to expand...
Click to collapse
Mobile Network Type
UMTS
Signal Strength
-101 dBm 4asu
Now answered in the stickied FAQ in the Q&A section.
unremarked said:
Q: The Nexus S only gets 3G? Omg, I only see a 3G icon!
The Nexus S gets UMTS and HSDPA, which are both technically 3G. Your phone idles on UMTS 3G, and when it starts downloading/uploading, it'll flip to HSDPA after a few moments. You can see this by typing *#*#4636#*#* into your Dialer, going to Phone Info, and looking at Network Type while downloading something. The ability to switch the icons on the notification bar is something that was added in custom ROMS, and is not supported by the stock ROM. Rest assured, if you are on a network that uses the 3G bands the Nexus S supports, then you are recieving HSDPA regardless of what icon you see.
Click to expand...
Click to collapse
EDIT: Also, in the future, use search and look at that FAQ prior to starting a new thread, mate. This has been asked a bajillion times.
unremarked said:
Now answered in the stickied FAQ in the Q&A section.
EDIT: Also, in the future, use search and look at that FAQ prior to starting a new thread, mate. This has been asked a bajillion times.
Click to expand...
Click to collapse
Question,
I always wondered, never really bothered asking, what should the setting be "preferred network type" by default my NS shows GSM/CDMA auto (PRL)
slowz3r said:
Question,
I always wondered, never really bothered asking, what should the setting be "preferred network type" by default my NS shows GSM/CDMA auto (PRL)
Click to expand...
Click to collapse
Found this for ya:
loganss said:
WCDMA preferred - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only - The GSM phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
WCDMA only - The GSM phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM auto (PRL) - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more. This one is a bit confusing to me since PRL is associated mostly with CDMA technology and not GSM technology.
CDMA auto (PRL) - The CDMA phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more.
CDMA only - The CDMA phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
EvDo only - The CDMA phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM/CDMA auto (PRL) - Some phones are equipped with both GSM and CDMA capabilities. This setting appears to just have the phone attempt to stay connected to the data communication type that works the best. (Maybe the Samsung Galaxy S will take advantage of this???)
Unknown - If none of the above fit or the phone is acting weird as far as connecting to the carrier, you will see your preferred network type is set to this
Click to expand...
Click to collapse
Source: http://www.google.com/support/forum/p/android/thread?tid=6a327a95211ac789&hl=en
unremarked said:
Found this for ya:
Source: http://www.google.com/support/forum/p/android/thread?tid=6a327a95211ac789&hl=en
Click to expand...
Click to collapse
Still sorta understood all that, so should I just leave it where Im at, i mean it is what came with the phone stock after all
As was stated, when an active data connection is formed and there is activity then the status will change under settings. I have an attached screenshot for your viewing pleasure.
slowz3r said:
Still sorta understood all that, so should I just leave it where Im at, i mean it is what came with the phone stock after all
Click to expand...
Click to collapse
PRL is preferred roaming list, iirc. When searching for a network, it'll get preference to those that are on the list over those that aren't. Supposed to be battery savings.
unremarked said:
PRL is preferred roaming list, iirc. When searching for a network, it'll get preference to those that are on the list over those that aren't. Supposed to be battery savings.
Click to expand...
Click to collapse
fair enough
I'm noticing this too. I get full HSDPA in the US on AT&T, but when I came to Taiwan and plugged in my prepaid sim for Taiwan Mobile which clearly has 7.2mbps HSPDA in this city, I only get the "3G" icon.
I did do the *#*#INFO#*#* to set my band to Euro which was how data kicked in. But otherwise it only shows "3G." Readingt he posts above, people say it idles on UMTS, but I have AT&T at home and it always shows the H icon. I can never the the H icon in Taiwan.
I have the 9020a which has 850/1900/2100, so I'm not understanding whats going on... Is the lack of 900 3G band hurting me?
Edit: I've been using this phone for 7 months on AT&T now and I just arrived in Taiwan last night....
正常啊。在 系統設定 - 關於手機 - 狀態 裡,看到 行動網路類型,會顯示為 hsdpa。這就是3.5g h了。雖然訊號顯示為3g,實際在支援hsdpa的地方會使用hsdpa的。
我是大陸的,語言可能不太好理解,見諒。

After 2 Weeks, I Am Throwing In The Towel

I received the Samsung Focus 2 weeks ago today. After I post this I will be heading over to Amazon Wireless to make return arrangements.
I come from a Windows Mobile (Tilt 2) and I don't think I am yet ready to transition to this type of phone. I depend too much on Pocket Informant and I couldn't find any app to replace that. Actually this is not really the reason I gave up. This is the reason that kept me on the fence.
At my work I have a very poor 3G signal indoors. The signal fluctuates between 2 bars to no signal indication and sometimes switching to Edge. With the Tilt 2 I turn off 3G and that keeps the phone happy. Several times I found the Focus showing no signal (small crossed out circle at the top left). Even after I went to an area with good 3G signal the Focus did not change from its no signal status. I had to actually turn it off and back on (soft reset, I guess) to get a strong 3G signal.
Searching on Google for means to turn 3G off in the Focus showed that only a few months ago there was such an option Settings | Cellular. Apparently now it is removed.
With 3G trying desperately to hang in there instead of just giving up and letting Edge take over, this phone is useless to me 8 to 12 hours a day. The Tilt 2 had a similar issue before I tweaked it to give me the band switch. However the Tilt 2 did not get stuck in the no signal state. I wish AT&T did not remove this from settings.
So long, Focus.
Um... there's totally still an option called Cellular in Settings. Whatever, though. If you don't enjoy the phone, there's no reason for you to keep it. However, there's equally no reason for you to share this information with us, since a large part of your issue is born of ignorance of the OS (not finding a setting that is clearly there) and your lack of enjoyment of the phone should have no effect on anyone who owns one.
FishFaceMcGee said:
Um... there's totally still an option called Cellular in Settings. Whatever, though. If you don't enjoy the phone, there's no reason for you to keep it. However, there's equally no reason for you to share this information with us, since a large part of your issue is born of ignorance of the OS (not finding a setting that is clearly there) and your lack of enjoyment of the phone should have no effect on anyone who owns one.
Click to expand...
Click to collapse
Yes, the Cellular option is still there, in Settings. However, unlike screen shots or pictures I saw during my search (see this sample), I do not have the option to turn off 3G.
If your phone has it, good for you. Mine does not. Hardly a reason to call me ignorant for this though.
That's strange. My Focus appears to have better reception than my Tilt 2.
Actually, the 3G only setting is under the diagnostic menu I believe. The should have a thread in this forum on it.
Update
I checked and its under the test menu
*#32489#
Back
Back
[7] Network control
[2] Band Setting
This may help you.
Tempest790 said:
That's strange. My Focus appears to have better reception than my Tilt 2.
Click to expand...
Click to collapse
For me, side by side, the 2 phones had a similar reception. The Tilt 2 got an extra bar or 2 when I forced it to Edge. However, the Tilt 2 did not get stuck with the no signal indication.
Actually, the 3G only setting is under the diagnostic menu I believe. The should have a thread in this forum on it.
Update
I checked and its under the test menu
*#32489#
Back
Back
[7] Network control
[2] Band Setting
This may help you.
Click to expand...
Click to collapse
While at this moment I do not have the phone with me, I just looked in the PDF I downloaded from that other thread (the PDF shows [2] Band Selection) and I remember that I was in that area and when I tried to make a change I got a message saying something about the selection or option being restricted. Sorry, but I do not remember the exact words. I guess I could try again later tonight after I get home. Thank you.
Tempest790 said:
Update
I checked and its under the test menu
*#32489#
Back
Back
[7] Network control
[2] Band Setting
This may help you.
Click to expand...
Click to collapse
When I select "[2] Band Selection" the exact message is:
"RAT Selection option is restricted".
Yeah, that's what I got. I also got my phone from freaking Amazon.com and didn't work right. Had do alittle talking around but they me exchange it at the Att Wireless Store. Have you actually tried any other Samsung Focus Phones to see if its just the phone itself?
I got mine from att store, I'm using the org diagnostic app version, I get same error message.
Seed 2.0 said:
I got mine from att store, I'm using the org diagnostic app version, I get same error message.
Click to expand...
Click to collapse
I would switch phones then. The phone has to be unlocked to switch bands, even turning off 3G. That's stupid, I know. I have a Dell Venue Pro sitting here that can switch bands but that phone is VERY buggy.
Fuzzy John said:
Yes, the Cellular option is still there, in Settings. However, unlike screen shots or pictures I saw during my search (see this sample), I do not have the option to turn off 3G.
If your phone has it, good for you. Mine does not. Hardly a reason to call me ignorant for this though.
Click to expand...
Click to collapse
FWIW: 3G = "Data Connection" on the Focus' settings menu. As far as I know, 3G has nothing to do with voice calls. I suspect that the name of that switch was changed with an eye toward future data options on cell phones. I hope that helps. (Even the person who posted that picture notes that they modified the label to be "Cellular Data". You can see that in the comments area of the image/post that you listed. )
GrayWolf is correct
These are GSM phone and voice only works on 2G.. data on 3G and Edge if necessary. that is why you can talk and use the internet at the same time. You turning 3G off does nothing for your call reception what so ever. When you turn off the Celluar data you turn off both 3G and edge. Also I believe the bars are only for the voice service.
ITDRAGON said:
GrayWolf is correct
These are GSM phone and voice only works on 2G.. data on 3G and Edge if necessary. that is why you can talk and use the internet at the same time. You turning 3G off does nothing for your call reception what so ever. When you turn off the Celluar data you turn off both 3G and edge. Also I believe the bars are only for the voice service.
Click to expand...
Click to collapse
This might very well be correct, however on my Tilt 2 I have to turn off 3g in order to get full voice bars back in the location where my room is in my house. It doesn't seem to make any sense; why would the phone's 3g connection interfere w/ the 2g voice? Yet it seems like this is the case.
ITDRAGON said:
GrayWolf is correct
These are GSM phone and voice only works on 2G.. data on 3G and Edge if necessary. that is why you can talk and use the internet at the same time. You turning 3G off does nothing for your call reception what so ever. When you turn off the Celluar data you turn off both 3G and edge. Also I believe the bars are only for the voice service.
Click to expand...
Click to collapse
Sorry. I may have used the wrong terms. After all I admit I am not really familiar with all the terminology. I am more like a user. Anyway, on my Tilt 2 phone I have a switch which turn off 3G. This puts the phone in Edge mode. Gives me a lot better reception in areas where the 3G signal is flaky. True, I cannot talk and do data at the same time. Also true that my data rate is slower. But I can receive and make calls while I am in that area.
ITDRAGON said:
GrayWolf is correct
These are GSM phone and voice only works on 2G.. data on 3G and Edge if necessary. that is why you can talk and use the internet at the same time. You turning 3G off does nothing for your call reception what so ever. When you turn off the Celluar data you turn off both 3G and edge. Also I believe the bars are only for the voice service.
Click to expand...
Click to collapse
Nope. Both voice and data work on 3G if it is available. You can tell this by the fact that once your phone is on 3G, you will not encounter the annoying speaker buzz from GSM phones.
The switch in the settings are for cell data connection. If you turn it off, it turns off the data connection, 2G or 3G. There is no separate setting to turn off 3G data only (a commonly requested feature but non-existent on all AT&T phones). You will always have to access the secret menu to select your band (WCDMA or GSM).
The bars are for signal strength, not just for vocie service.
EDIT: rjohnstone
foxbat121 said:
Nope. Both voice and data work on 3G if it is available. You can tell this by the fact that once your phone is on 3G, you will not encounter the annoying speaker buzz from GSM phones.
The switch in the settings are for cell data connection. If you turn it off, it turns off the data connection, 2G or 3G. There is no separate setting to turn off 3G data only (a commonly requested feature but non-existent on all AT&T phones). You will always have to access the secret menu to select your band (WCDMA or GSM).
The bars are for signal strength, not just for vocie service.
Click to expand...
Click to collapse
<snipped my "you're wrong" message, but leaving my other data here.>
http://en.wikipedia.org/wiki/3G contains the following quote:
"The UMTS system, first offered in 2001, standardized by 3GPP, used primarily in Europe, Japan, China (however with a different radio interface) and other regions predominated by GSM 2G system infrastructure. The cell phones are typically UMTS and GSM hybrids. Several radio interfaces are offered, sharing the same infrastructure"
<snipped my "you're wrong" message, but leaving my other data here.>
http://www.phonescoop.com/phones/phone.php?p=2877
"Modes GSM 850 / 900 / 1800 / 1900
WCDMA 850 / 1900 / 2100"
Those are the GSM and 3G bands that the Samsung Focus uses. <snipped my "you're wrong" message, but leaving my other data here.>
I'm always willing to accept that I can be wrong (EDIT: and it seems that I was). I'm only human after all. If I'm the one who's somehow misunderstanding, then I would be open to having some information shared so that I can learn more about it. Would you have any links to back your claim up?
GrayWolf said:
I'm sorry to say that you've misunderstood how AT&T's network is set up. 3G + GSM = Data + Voice. Not 3G = Voice & Data.
contains the following quote:
"The UMTS system, first offered in 2001, standardized by 3GPP, used primarily in Europe, Japan, China (however with a different radio interface) and other regions predominated by GSM 2G system infrastructure. The cell phones are typically UMTS and GSM hybrids. Several radio interfaces are offered, sharing the same infrastructure"
To further back the position that our phones do not use 3G to carry voice data:
"Modes GSM 850 / 900 / 1800 / 1900
WCDMA 850 / 1900 / 2100"
Those are the GSM and 3G bands that the Samsung Focus uses. GSM for voice traffic, WCDMA (3G) for data.
I'm always willing to accept that I can be wrong. I'm only human after all. If I'm the one who's somehow misunderstanding, then I would be open to having some information shared so that I can learn more about it. Would you have any links to back your claim up?
Click to expand...
Click to collapse
AT&T sends both voice and data traffic over the 3G connection when in a 3G area.
The GSM radio only comes into play when the data connection falls back to EDGE (i.e., 3G signal is too weak or not present).
This is why your call drops when you switch from a 3G area to a GSM/EDGE area.
It's a hard hand off to the next tower.
rjohnstone said:
AT&T sends both voice and data traffic over the 3G connection when in a 3G area.
The GSM radio only comes into play when the data connection falls back to EDGE (i.e., 3G signal is too weak or not present).
This is why your call drops when you switch from a 3G area to a GSM/EDGE area.
It's a hard hand off to the next tower.
Click to expand...
Click to collapse
Thanks - would you happen to have any links that explains this in any detail?
I looked around after you mentioned it and found that I should have ran a few more keyword searches before posting. So far, the best explanation that I've found seems to be here:
"3G or Non 3G-that is the question"
http://forums.wireless.att.com/t5/G...at-is-the-question/m-p/1544262/highlight/true
The specific/relevant portion that I'm referring to is:
Yea 3G is amazing. It's the replacement for GSM. It's a completely seperate network. When in 3G at present signal in some area's might seem a bit more week than GSM because in some area's it runs on the 1900mhz frequency which has less penetration. But AT&T has plans of phasing out GSM in the future for 3G on the GSM frequency.
But 3G on the W-CDMA side handles call's and data, GSM also does handle voice and data. But the two networks are seperate. For example. If your phone is in 3G then the 3G network is handling the call and not transmitting anything to do with GSM at all. But if you travel to a non 3G area while in the call then your phone will hand off to the GSM network to continue the voice call and the call quality will get that crackly raspy phenomenom. Hope this helps!
Click to expand...
Click to collapse
Now that's another person's statement on a forum and, like rjohnstone's post, makes logical sense. I'd love to read a bit more about this, if there are any useful links out there?
GrayWolf said:
Thanks - would you happen to have any links that explains this in any detail?
I looked around after you mentioned it and found that I should have ran a few more keyword searches before posting. So far, the best explanation that I've found seems to be here:
"3G or Non 3G-that is the question"
The specific/relevant portion that I'm referring to is:
Now that's another person's statement on a forum and, like rjohnstone's post, makes logical sense. I'd love to read a bit more about this, if there are any useful links out there?
Click to expand...
Click to collapse
Graywolf,
My friend is a tower manager for T-Mobile.
He helped setup the initial GSM/EDGE network for Cingular back when they leased tower time from T-Mobile while they were making the transition from TDMA devices from the old AT&T network.
He explained how the call handlers worked and how the air interface works when handing off from UMTS/HSPA over to the GSM/EDGE network.
All of AT&T's handsets are programmed to use either GSM/EDGE or UMTS/HSPA, not both at the same time.
The point is, a handset can't have a GSM voice call and an HSPA data session occurring at the same time. The radios are not configured to allow it.
Many towers run both GSM/EDGE radios and UMTS/HSPA/HSPA+ radios.
Mainly to support legacy devices.
You will also notice that the old network is still there when you turn of the 3G radio in an iPhone or any other handset that permits it.
Yes, AT&T is working to decommission the older GSM/EDGE towers all together to recover the 850Mhz frequencies for use with HSPA+. This will give them better building penetration in large metropolitan areas.
Right now, AT&T does use the 1900MHz band for HSPA, and as the residence of NY will tell you, it sucks at going through walls.
You will have to do some digging for old AT&T press releases, but the info is out there.
Gotta give credit where it's due. I appreciate the technical detail combined with layman phrasing. I'll do more digging later but you've given me a nice high-level view of things. I did have a suspicion that my understanding was flawed somehow. Thanks for taking the time to share, rjohnstone!
Yep your right I typed it wrong.. voice and data both work on 2G and 3G, but I know I'm in a 3G area only and when I turn data off 3G goes out. Now that doesn't mean I'm only making or recieving calls on the 2G band. It just mean 3G data is off. So if you want to turn off 3G all together, I don't see it on these phones yet. When I turn the celluar data back on, the 3G symbol comes back on, because it would be pretty dumb for the 3G to be controlled by turning data on and off.

Network coverage issues or device ?

I'm having some problems with my G2 - I don't have good 3G coverage especially inside and my phone keeps dropping calls when on 3G. It seems the software doesn't reconnect that fast and doesn't switch to 2G when the 3G signal is too low. Is there any way to change the preferred network and stop the device being so agressive at keeping 3G connection?
Settings/networks/tethering & networks/mobile networks/network mode/GSM only.
I already know that. It is the most unhelpful advice to give. I have to constantly go into settings and change that? No way. It isn't in the notification toggles which is really odd. Any idea how to add it? I feel my G2 has some radio issues.
Sent from my LG-D802 using Tapatalk
axlastro said:
I already know that. It is the most unhelpful advice to give. I have to constantly go into settings and change that? No way. It isn't in the notification toggles which is really odd. Any idea how to add it? I feel my G2 has some radio issues.
Sent from my LG-D802 using Tapatalk
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Well if you're going to be like that then there's no wonder why there aren't a stream of responses on here with people trying to help you out.
Just remember, you're the one with the problem, so you may want to be a little nicer to those that try to give you help.
I'm sorry about that, but there wasn't a stream of responses in the first place. He was just stating the obvious, and the obvious is that the G2 doesn,t have a shortcut to switch between 2g and 3g. I'm just trying to figure out a way to do that, but all the apps that claim to do that and they are too many of them, just don't work. I'm thankful for any help, don't get me wrong.
Sent from my LG-D802 using Tapatalk
axlastro said:
I'm sorry about that, but there wasn't a stream of responses in the first place. He was just stating the obvious, and the obvious is that the G2 doesn,t have a shortcut to switch between 2g and 3g. I'm just trying to figure out a way to do that, but all the apps that claim to do that and they are too many of them, just don't work. I'm thankful for any help, don't get me wrong.
Sent from my LG-D802 using Tapatalk
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There isn't a solution as simple as hitting a switch, but you can try the following:
Go into your Dialer and tap in *#*#4636#*#*
This will take you into the Testing Menu
Select 'Phone Information'
Then about half way down you will have a drop down where you can "Set preferred network type:"
This will allow you to choose whether to use 2G or 3G, but more important to your case you can choose how it will react if signal strength is low.
You probably want to select something like "GSM auto (PRL)"
Bare in mind though that this option will reset itself back to original setting each time you reboot the device.
Now I don't know if this will solve your problem, but it is worth testing out.
Here's a list detailing the main available options:
WCDMA preferred - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only - The GSM phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
WCDMA only - The GSM phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM auto (PRL) - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more.
CDMA auto (PRL) - The CDMA phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more.
CDMA only - The CDMA phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
EvDo only - The CDMA phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM/CDMA auto (PRL) - Some phones are equipped with both GSM and CDMA capabilities. This setting appears to just have the phone attempt to stay connected to the data communication type that works the best.
Unknown - If none of the above fit or the phone is acting weird as far as connecting to the carrier, you will see your preferred network type is set to this
Wnderful setting.. amazing speed... performance of handset increased like rocket..
Thanks a lot...
Hi,
After dialing *#*#4636#*#*, it shows up the menu.
But i am not able to select Phone Information option. It says "This application does not work on this device".
Phone info: LG G2 D802 - Rooted - PowerG2 2.1 ROM.
I face frequent network signal drop, I tried CloudyG2 ROM also.
Thanks !

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