2G vs 3G - Vibrant General

While 2G save a lot of battery power. I was wondering does the voice quality get affect?? I don't care about data, I just want to know if voice quality get affected at all. I know like ATT does only Half duplex on 2g and on 3g they have full duplex or something to that nature. Does Tmob do the same?

NexusX said:
While 2G save a lot of battery power. I was wondering does the voice quality get affect?? I don't care about data, I just want to know if voice quality get affected at all. I know like ATT does only Half duplex on 2g and on 3g they have full duplex or something to that nature. Does Tmob do the same?
Click to expand...
Click to collapse
Voice works on 2g not 3g. So if your on 3g and receive a call its really using your 2g. That's why we can data and talk same time. 3g uses the data and talking uses the edge/2g...

smashpunks said:
Voice works on 2g not 3g. So if your on 3g and receive a call its really using your 2g. That's why we can data and talk same time. 3g uses the data and talking uses the edge/2g...
Click to expand...
Click to collapse
Actually no, 3G does voice and data.
If you don't have a discerning ear you probably won't be able to tell the voice quality difference over 2G and 3G.

Currently you should have better voice on 3G. Currently 3G uses a 12.2 kbps codec, while the 2G system uses a variable codec that is at 10.2 most of the time but can drop as low a 4.75 based on traffic load and quality. Most people can't tell the difference until it gets below 6.25 kbps.

Related

Hero, have to choose: Data/3G or voice calls, HTC reinvet the 90's!

Hi,
after having several missed calls going straight to my answering machine on my new HTC Hero. I was getting a bit paranoiac, so I've decided to test in/out calls.
Basically, 90 of my incoming calls were going straight to my answering machine. Out-call were about 30% KO
After several tests, to make sure there was a problem, I've decided to request for support from HTC.
Support told me that I should shut the 3g connection every time I would want to receive a call .
So I tried and Bingo, if 3G is activated, I get 10% of the calls, if I deactivate it 90% success.
So you'll say, I should be happy? Right? Wrong!
The main use of that kind of phone is to have a data integration, otherwise I would have kept my old nokia from 10 years ago..
Here basically, if I follow HTC idea, I should keep the 3g closed, sometime, I should switch it on to get my mails, thanks to the non true push capacities (ok this one is not htc) then wait for the sync, maybe force it , get my mails, and then, shut 3g back and pray that no Über important call would have been done.
Well that plain sucks!
Never had such a thing on my previous Data friendly mobiles, why should I accept it on the Hero?
If someone have come across this bug, cause it is a bug, how did he/she managed to fix it?
Thanks
works fine on mine....i suggest you are on a ****e network, or on only 2G where you are. that's what usually causes this.
I guess they suggested this because it sounds like your network hasn't figured out how to route calls properly on their network when data is active, and they dump it straight to voicemail when there is a data connection active.
not the phone's fault, the phone won't even know that the call has been missed, the network simply does not route the call through and sends it to voicemail instead.
i had this on O2 a while ago. went to t-mobile (who knew how to set up their network properly for data) and never had this issue since when i am on 3G coverage. if i'm on 2G signal and have active data then yes, i miss calls. but that's how 2G networks operate.
it's truly shocking how many networks out there have absolutely no idea how to set up their networks properly for data!
Well I wish it would be that, my signal goes from -63 dbm 25 asu(80% of the time) to -81 dbm 16 asu.
Just after my post, I called one of my friend working in carrier terminal validation.
What he told me was, 2 options:
- Same bug was on the htc cruise, bug got corrected after a fw update.
- Some of my carrier radio are buggy and 3g goes over gsm.(SFR/VOdaphone France)
I bet for the first option since I had the problem in various places since I didn't want to ask support for nothing and get busted for a " feeling and not facts" (did the test in 3 differend location 80 tests in total(I used to be a tester....).
I will update the topic if I get news about it
nmuncer said:
!
Never had such a thing on my previous Data friendly mobiles, why should I accept it on the Hero?
If someone have come across this bug, cause it is a bug, how did he/she managed to fix it?
Thanks
Click to expand...
Click to collapse
You shouldn't accept it - but most people don't have this issue!
It's unlikely to be a "bug" per se, because otherwise it would be endemic behaviour, so it's either:
1. Your physical device (get it changed!)
2. Your network.
In addition, just an FYI in case you've got the new Sprint Hero, but most CDMA networks (including Sprint) do not support simultaneous voice and data. I've no idea what happens in practice on Sprint, but I'd imagine if you were actively using data your voice calls would get diverted to voicemail unless Sprint automatically suspends data when a voice call is pending.
Regards,
Dave
You're on SFR?
OUCH!!!!
Sounds like you have a nice strong signal, but is it 2G or 3G? (do you see a G, E 3G or H at the top of the screen?
if you see G or E, it's cos you're on 2G, If you get 3G or H, it's on 3G.
And yes, there were a few issues with the P3300 and the cruise, but they were mainly on Bouygues, not so much on SFR.
There's nothing known of on the hero, and as SFR sell the Magic, i would have thought they would have ironed out any issues already...
Hi,
I'm mostly in HSDPA or 3G.
I still have contacts with people at SFR (used to work there till recently) they might share a bit of info.
Idk if yours is CDMA or the GSM one but on mine (CDMA) under the mobile network settings, I have the option to switch the mode of operation to ether Hybrid, EVDO only, and 1X only. Now, I know how Sprint's network works, not sure if it's the same for any other networks but if I set it to Evdo only (3g) I'll miss all my calls because Sprint does voice over 1X. Hybrid mode does EVDO when you're using data and switches to 1X when you're doing voice/sms.
rhedgehog said:
if you see G or E, it's cos you're on 2G, If you get 3G or H, it's on 3G.
...
Click to expand...
Click to collapse
Regarding this and your suggestion that 2g and data will result in missed calls, Can you suggest how to avoid this happening? I live and work in the country and only have 2g, so have found quite often people have mentioned my phone not even ringing- straight to answer phone. This explains it.
Nice to know, but annoying if I can't solve it- I run a business and my phone is very important.
Cheers,
ajones7279 said:
Idk if yours is CDMA or the GSM one but on mine (CDMA) under the mobile network settings, I have the option to switch the mode of operation to ether Hybrid, EVDO only, and 1X only. Now, I know how Sprint's network works, not sure if it's the same for any other networks but if I set it to Evdo only (3g) I'll miss all my calls because Sprint does voice over 1X. Hybrid mode does EVDO when you're using data and switches to 1X when you're doing voice/sms.
Click to expand...
Click to collapse
i have sprint as well and when someone calls you when youre running hybrid, you should not miss calls. you will get disconnected from the internet when someone is calling though
ajones7279 said:
Idk if yours is CDMA or the GSM one but on mine (CDMA) under the mobile network settings, I have the option to switch the mode of operation to ether Hybrid, EVDO only, and 1X only. Now, I know how Sprint's network works, not sure if it's the same for any other networks but if I set it to Evdo only (3g) I'll miss all my calls because Sprint does voice over 1X. Hybrid mode does EVDO when you're using data and switches to 1X when you're doing voice/sms.
Click to expand...
Click to collapse
Hi, I'm on hybrid
that is what i hate about hero, it is really great except for the fact that it switches from 2g to 3g without notice. i want it to be permanently stuck in 3g for faster downloads and mms, but when it uses 2g, i cant send and receive mms and surfing the web is slow as heck! im still looking for an app that would permanently put the device in 3g just like with winmo it which you can use wcdma ONLY.
cheers!
If you use AnyCut, you can create a short cut by selecting:
New Shortcut->Activity->Phone info
This will create a shortcut on your homescreen which beings up a hidden "engineering" screen on which you'll find an drop down for "Set preferred network type" where you can select WCDMA only.
Regards,
Dave
alternatively, open the phone app
dial *#*#4636#*#* and select phone info
scroll down and set it to WCDMA only.
does the same thing but saves installing an app.
rhedgehog said:
alternatively, open the phone app
dial *#*#4636#*#* and select phone info
scroll down and set it to WCDMA only.
does the same thing but saves installing an app.
Click to expand...
Click to collapse
holy monkey! im going to try this!!! do i have to di it everytime i turn the phone of or is it permanent?
orouborus said:
that is what i hate about hero, it is really great except for the fact that it switches from 2g to 3g without notice. i want it to be permanently stuck in 3g for faster downloads and mms, but when it uses 2g, i cant send and receive mms and surfing the web is slow as heck! im still looking for an app that would permanently put the device in 3g just like with winmo it which you can use wcdma ONLY.
cheers!
Click to expand...
Click to collapse
That is not specific to the Hero. The fact is, every carrier's 2G network has better coverage than their 3G network. When the phone cannot detect strong enough 3G signal, it jumps back to 2G network. The idea is that slow data transmission is better than no data transmission at all. Many smartphones have the option to lock the mobile network to 2G only. One advantage is that it gets better reception, and another advantage is longer battery life (the 3G chip eats battery much faster than 2G).
If you instead lock the phone to its 3G network. The first thing you will notice is that battery life is significantly shorter. And chance is that you may be getting very spotty reception, because you are not allowing to phone to switch to 2G when it gets no 3G signal. When there is no 3G signal, forcing the phone to "3G only" mode won't give you faster download, it gives you no download.
tsekh501 said:
That is not specific to the Hero. The fact is, every carrier's 2G network has better coverage than their 3G network. When the phone cannot detect strong enough 3G signal, it jumps back to 2G network. The idea is that slow data transmission is better than no data transmission at all. Many smartphones have the option to lock the mobile network to 2G only. One advantage is that it gets better reception, and another advantage is longer battery life (the 3G chip eats battery much faster than 2G).
If you instead lock the phone to its 3G network. The first thing you will notice is that battery life is significantly shorter. And chance is that you may be getting very spotty reception, because you are not allowing to phone to switch to 2G when it gets no 3G signal. When there is no 3G signal, forcing the phone to "3G only" mode won't give you faster download, it gives you no download.
Click to expand...
Click to collapse
true true. i usually charge my phone everynight though. problem that i have with 2g is that i cant send and recieve mms and yeah data connection is slow. in our place 3g signal is ok. i also lock my topaz for wcdma only. but it is ok that it switches to 2g in low signal areas.
Thanks!
You actually use mms?
Wow, they do exist.
barryallott said:
You actually use mms?
Wow, they do exist.
Click to expand...
Click to collapse
yeah... mms is great. i use it to send items that i wish to purchase etc.
What NOM1 Networks are there in the UK? I only get 2g in my area (booo) and could do with an operator that works right. T-Mobile forums suggest they still have an issue
Hi
I've checked it with Hero running in PlusGSM in Poland.
Regardless if I select 2G/3G or even "WCDMA preffered/GSM Only/WCDMA only" setting the phone is not available for incoming voice calls during data transfer. Every time when I start internet connection (example: SSH session) I'm not available for incoming calls. At this site I do have both strong 2G and strong 3G networks.
I would like to mention that a few days ago I've swapped Samsung SGH-i600 (WinMo 6.0) for HTC Hero - so I'm using the same SIM card in the same network and the same place. SHG-I600 was able to perform both data transfer (on 2G) and voice (on 3G) on the same time. HTC Hero is not...
I wonder if this is 'feature by design' or a bug in software?

Problem with HD2, anyone else had this issue

This morning my phone stopped working. Screen went off, couldn't wake it up and couldn't charge it. None of the buttons did anything. I decided to try a soft reset as a last resort and it's working again now. HAs anyone else had this issue, and is it something that occurs a lot? I'm not happy about this
Morning,
Search is your friend. Look on here for a thread started by Beards. Has all the info and solutions you need for this.
Use this to search as XDA search is a bit hit and miss..http://www.google.com/advanced_search?q=+site:http://forum.xda-developers.com&hl=en&lr=&as_qdr=all
WB
wacky.banana said:
Morning,
Search is your friend. Look on here for a thread started by Beards. Has all the info and solutions you need for this.
Use this to search as XDA search is a bit hit and miss..http://www.google.com/advanced_search?q=+site:http://forum.xda-developers.com&hl=en&lr=&as_qdr=all
WB
Click to expand...
Click to collapse
I can't find anything on XDA search to be honest. I tried that link you sent, but I can't find it on that either, any hints as to what keywords I should be using?
I also tried searching by members list, and finding all posts by beards, but I just get this long list, any idea which one he/she is?
http://forum.xda-developers.com/memberlist.php?&order=asc&sort=username&ausername=beard
try searching the site for standy screen of death.
Its a problem that has afflicted many HTC devices and seems somehow related to the phone moving between 2G and 3G in areas of poor 3G signal
rumpleforeskin said:
try searching the site for standy screen of death.
Its a problem that has afflicted many HTC devices and seems somehow related to the phone moving between 2G and 3G in areas of poor 3G signal
Click to expand...
Click to collapse
Thanks for that hint, found lots of info on it now. This is going to show how really clueless I am, but apart from 3G being a lot faster I'm not sure what the difference is between 2G and 3G. Also, is the 2G and 3G just related to data usage/transfer, or is it calls as well?
If it's just data transfer then I may as well set it to 3G only as I'm too impatient to wait for the internet etc on 2G. If it responsible for the connection of calls as well I'm going to have to leave it on both as I quite frequently go from3G to 2G areas, and I don't want to keep losing signal for my phone.
Snerkler,
Take a look at this thread...http://forum.xda-developers.com/showthread.php?t=596484
WB
> If it's just data transfer then I may as well set it to 3G only as I'm too impatient to wait for the internet etc on 2G. If it responsible for the connection of calls as well I'm going to have to leave it on both as I quite frequently go from3G to 2G areas, and I don't want to keep losing signal for my phone.
GSM (2G) handles all the voice traffic and SMS in UK, plus basic GPRS speed at up to 56Kbps. Where available it also includes (E)dge connections for data up to about 100Kbps (technically can go much higher, but this is the practical limit)
3G and HSDPA (Also termed UMTS and WCDMA) are data only and can allow 330Kbps and up to 7.2Mbps respectively though you'll generally see around 200Kbps and 1-1.5Mbps as usable maxima. These protocols are also used for video calling and MMS media content. However if a device is set for WCDMA only, it can still make/receive voice and SMS services.
If all you do is use email, voice, SMS and basic web page browsing, there is an advantage in constraining the connection to GSM only, as the battery life will improve by up to 25%. For occasional higher volume web browsing it may still be worth staying on GSM, but switching to Auto or WCDMA when needed.
For frequent web use, then it's best to stay on Auto and take the battery hit. Don't select WCDMA only- the 3G service in UK is still patchy and if you go out of a 3G area, you;ll get no signal at all with this selection.
You may also see a few posts on here relating to auto-disconnecting the data signal after a timeout. In general this is not a good idea with current 'connected' devices as it prevents all the 'push' updating of email, Facebook etc. The programs to allow this were originally produced to prevent unwanted data charges when data was expensive, or when roaming. A lot of users are now utilising this in an effort to improve battery life- this is a little futile as the data connection itself uses the normal phone signal service channels and therefore negligible battery power, unless the 3G service is switched off at the same time.
wacky.banana said:
Snerkler,
Take a look at this thread...http://forum.xda-developers.com/showthread.php?t=596484
WB
Click to expand...
Click to collapse
Cheers for this, read through to page 8 so far, will read the rest later. WHy can't I find the threads I want when I search?
I may as well just PM you everytime WB lol
NeilM said:
> If it's just data transfer then I may as well set it to 3G only as I'm too impatient to wait for the internet etc on 2G. If it responsible for the connection of calls as well I'm going to have to leave it on both as I quite frequently go from3G to 2G areas, and I don't want to keep losing signal for my phone.
GSM (2G) handles all the voice traffic and SMS in UK, plus basic GPRS speed at up to 56Kbps. Where available it also includes (E)dge connections for data up to about 100Kbps (technically can go much higher, but this is the practical limit)
3G and HSDPA (Also termed UMTS and WCDMA) are data only and can allow 330Kbps and up to 7.2Mbps respectively though you'll generally see around 200Kbps and 1-1.5Mbps as usable maxima. These protocols are also used for video calling and MMS media content. However if a device is set for WCDMA only, it can still make/receive voice and SMS services.
If all you do is use email, voice, SMS and basic web page browsing, there is an advantage in constraining the connection to GSM only, as the battery life will improve by up to 25%. For occasional higher volume web browsing it may still be worth staying on GSM, but switching to Auto or WCDMA when needed.
For frequent web use, then it's best to stay on Auto and take the battery hit. Don't select WCDMA only- the 3G service in UK is still patchy and if you go out of a 3G area, you;ll get no signal at all with this selection.
You may also see a few posts on here relating to auto-disconnecting the data signal after a timeout. In general this is not a good idea with current 'connected' devices as it prevents all the 'push' updating of email, Facebook etc. The programs to allow this were originally produced to prevent unwanted data charges when data was expensive, or when roaming. A lot of users are now utilising this in an effort to improve battery life- this is a little futile as the data connection itself uses the normal phone signal service channels and therefore negligible battery power, unless the 3G service is switched off at the same time.
Click to expand...
Click to collapse
I fI'm reading this right, you need 2G to make and receive calls, therefore if you select 3G only then you can't make and receive calls?
snerkler said:
I fI'm reading this right, you need 2G to make and receive calls, therefore if you select 3G only then you can't make and receive calls?
Click to expand...
Click to collapse
No- if you select 3G only you can make/receive calls and exchange fast data- but only if you are in a 3G coverage area. Out of 3G coverage and there's nothing
GSM only: Voice, SMS, Data wherever theres a signal. Good battery life. Slow data
3G only: Voice, SMS, fast Data, but nothing at all out of 3G coverage. Higher battery drain
Auto: Switches between the 2 above, but favours 3G where available so again, higher battery drain especially in marginal 3G signals where it will continually switch between protocols, potentially using a lot of battery power.
NeilM said:
No- if you select 3G only you can make/receive calls and exchange fast data- but only if you are in a 3G coverage area. Out of 3G coverage and there's nothing
GSM only: Voice, SMS, Data wherever theres a signal. Good battery life. Slow data
3G only: Voice, SMS, fast Data, but nothing at all out of 3G coverage. Higher battery drain
Auto: Switches between the 2 above, but favours 3G where available so again, higher battery drain especially in marginal 3G signals where it will continually switch between protocols, potentially using a lot of battery power.
Click to expand...
Click to collapse
Ok, thanks for clearing this up. If I want to improve battery life, am I best to have it set to 2G, unless I want to use internet/email, and if I want to do that then swap it to 3G for this (assuming I don't want push mail)?
Also, most of the time I'm hooked up to wifi, so I'm assuming in this case I don't need 3G at all?
snerkler said:
Ok, thanks for clearing this up. If I want to improve battery life, am I best to have it set to 2G, unless I want to use internet/email, and if I want to do that then swap it to 3G for this (assuming I don't want push mail)?
Also, most of the time I'm hooked up to wifi, so I'm assuming in this case I don't need 3G at all?
Click to expand...
Click to collapse
Even email (polled or push) is fine over 2G unless you are receiving large attachments.
When you are on WiFi, data should take that path so you are correct- 3G won't be needed.

3g htc hd 2

At the top were you see signal strength I nebver seem to have 3G enabled and internet seems to be slugish I sometimes have the Letters G,H,U I don't know what these mean is there a way I can have 3G all the time?
Thanks. Stock Rom!
as far as i know h and u stand for 3g not sure tho
djteotancolis said:
as far as i know h and u stand for 3g not sure tho
Click to expand...
Click to collapse
I don't think it does its so slow. I want to know how to enable 3G permanently.
were you getting faster 3g on other phones? and i think there is a cab but u may have to search for that
As far as I know (In my area) H is for HSDPA, which is an enhanced form of 3G. So it seems that you are getting 3G data... While G stands for GPRS, which is 2G.
No idea what the U would stand for though.
Also, if you have 3G enabled to auto-connect (I presume it is, if it's switching between the connections,) then your phone should just pick up a 3G signal whenever it can find it. If 3G is patchy in your area, you won't be able to get it all the time.
theblake said:
As far as I know (In my area) H is for HSDPA, which is an enhanced form of 3G. So it seems that you are getting 3G data... While G stands for GPRS, which is 2G.
No idea what the U would stand for though.
Also, if you have 3G enabled to auto-connect (I presume it is, if it's switching between the connections,) then your phone should just pick up a 3G signal whenever it can find it. If 3G is patchy in your area, you won't be able to get it all the time.
Click to expand...
Click to collapse
Right I see when I'm on HSDPA it is still very sluggish until I seem to hit 3G and its like wi-fi, so my 3G is already connected just needs a place with good signal when I'm on way to college on the bus I seem so find a good area with 3G. Thanks for your help.
H = 3G
G = 1G (G is much much slower than E=Edge=2G)
If you want to have 3G only enabled go to Settings>Wireless Controlls>Phone>Band>WCDMA (Note that if you're in an area with no 3g, you will have zero signal and the phone will not switch to edge or gprs).
In the right order:
G=1G: 'Global System for Mobile communication', or GSM, basic mobile network.. can be used only for SMS and Phone calls
E=2G: EDGE (or 'Enhanced Data Rates for GSM Evolution'), basicly GSM and GPRS (data transfer) combines..it allowes for speeds over the mobile network up to 9 600 bit/s
U=3G: 'Universal Mobile Telecommunications System', or 'UMTS' up to 2 Mbit/s data transfer on stationary devices and up to 384 kbit/s on mobile devices. About 40 times faster than GSM. This enables you to transfer data, such as images and be able to transfer data during a phonecall.. like sending a MMS or using Video Calls.
H=3G: 'High Speed Downlink Packet Access', or HSDPA, it allows for speeds up to 14,4 Mb/s though it is normally (at least in scandinavia) offered commercially in lower speeds, up to 7,2 Mb/s
Note: Because the most operators use high frequency to transmit '3G' signals, wich can cause your signal to be lower if you're inside (house or whatever, not outside), some operators though, transmit on a lower frequency, though then it's called CMDA, wich is also a form of '3G'
Had the same problem with a Telstra HD2 on Optus. Here's what you need to do. Settings -> Wireless controls -> phone -> Band -> Select auto for both. That should do it.

Why no voice and data?

I was on the Phone with Dell trying to order my new Sony Bravia TV and I was trying to use the internet so I could give the rep the proper item number. To my surprise I couldnt surf the web and do voice at the same time. I thought on GSM network this was possible. When I had Cingular a few years back this was possible. What gives? Why am I not about to do both at the same time?
That's strange. I've been on the phone and surfed the internet and/or used most of the other functions on the phone at the same time.
I've had no problems talking and surfing at the same time provided I had a 3G signal. Maybe you were in a marginal reception area and the signal wasn't solid but it does work.
I dont know why it didnt work, and it sorta pissed me off, does it have to be 3g in order to do voice and data
937dytboi said:
I dont know why it didnt work, and it sorta pissed me off, does it have to be 3g in order to do voice and data
Click to expand...
Click to collapse
Nope. This is my first 3g phone on t-mobile. Never had a problem with edge voice + data
937dytboi said:
I was on the Phone with Dell trying to order my new Sony Bravia TV and I was trying to use the internet so I could give the rep the proper item number. To my surprise I couldnt surf the web and do voice at the same time. I thought on GSM network this was possible. When I had Cingular a few years back this was possible. What gives? Why am I not about to do both at the same time?
Click to expand...
Click to collapse
Was data working otherwise in that area? I've been in some areas where data doesn't work at all.
it should have been.
On edge I can't get consistant voice and data with any phone I've ever had, it is more consistant when getting a 3G signal.
You need a 3G signal to do Voice + Data as 2G (G)PRS nor 2.5G (E)DGE have enough bandwidth to support both.

Anybody use GrooveIP/Talkatone over 3G?

So i had setup and tested both apps at home over WiFi and the talk quality seemed perfectly fine, but I was a bit disappointed when I went out on a work day and tried to make some calls over 3G, it did not work out so well. It also does not help that I live in such a rural area with lack of coverage in some areas, but I can say that voice calls on my phone come in crystal clear. I've had either static, echo or bad delay time in voice transition.
So I'm wondering what other people have experienced trying to make VOIP calls over 3 G instead of WiFi, and if anyone has any tips, other than just use my phone.
I think the apps need better compression for when they work on 3G.
teeth_03 said:
So i had setup and tested both apps at home over WiFi and the talk quality seemed perfectly fine, but I was a bit disappointed when I went out on a work day and tried to make some calls over 3G, it did not work out so well. It also does not help that I live in such a rural area with lack of coverage in some areas, but I can say that voice calls on my phone come in crystal clear. I've had either static, echo or bad delay time in voice transition.
So I'm wondering what other people have experienced trying to make VOIP calls over 3 G instead of WiFi, and if anyone has any tips, other than just use my phone.
I think the apps need better compression for when they work on 3G.
Click to expand...
Click to collapse
It really just sounds like a carrier issue. I use groove IP with att grandfathered unlimited data and when I'm at work call quality is considerably lower because of spotty signal. When you say phone calls come in clear do you mean a regular cell? You can have a strong cell signal with bad data connectivity
Sent from my Nexus 7 using xda premium

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