i was reading this article and it said it wouldnt work..
Where are you getting 3G for T-mobile in the US? I only heard it was in NYC at the moment.
Sadly, the answer is most likely not.
T-Mobile is deploying 3G service on the 1700 MHz UMTS band, which the Hermes, and a lot of other phones, can not use.
My confusion is that T-Mobile USA has submitted the Kaiser for approval to the FCC, and the manual that comes with it lists the Kaiser as supporting 1700… in the Japanese version.
So are they using a modified Japanese version, or releasing it as a EDGE-only phone (which would be a mistake IMO), or something else? I sure don’t know, but I’m expecting to have to replace my beloved hermes with something else if I want to make use of the upcoming 3G.
jdc said:
Sadly, the answer is most likely not.
T-Mobile is deploying 3G service on the 1700 MHz UMTS band, which the Hermes, and a lot of other phones, can not use.
My confusion is that T-Mobile USA has submitted the Kaiser for approval to the FCC, and the manual that comes with it lists the Kaiser as supporting 1700… in the Japanese version.
So are they using a modified Japanese version, or releasing it as a EDGE-only phone (which would be a mistake IMO), or something else? I sure don’t know, but I’m expecting to have to replace my beloved hermes with something else if I want to make use of the upcoming 3G.
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After they fully release 3G, I hope that T-Mobile USA ventures into getting the Raphael since they NEED a good flagship of a phone in their lineup. AT&T already has the Kaiser and iPhone (not a fan, but it's a popular phone though)
But I'll be patient. I have 1 more year before I'm eligible for an upgrade, hopefully they'll have something worth it by then...
Answer
Absolutely not. It wont now and it wont in the future., T-Mo uses 1700 and at&t uses 2100. They will not interchange because neither side wants the others users sucking up they're bandwidth. Do not expect to see 3q dual band handsets that are "intended" for the US anytime soon.
CaptMorgan said:
Absolutely not. It wont now and it wont in the future., T-Mo uses 1700 and at&t uses 2100. They will not interchange because neither side wants the others users sucking up they're bandwidth. Do not expect to see 3q dual band handsets that are "intended" for the US anytime soon.
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Well, that's subject to a bunch of things, while AT&T may not want "T-Mobile Customers sucking up their bandwidth", EDGE is pretty fast in comparison to some DSL connections and the vast majority of T-Mobile customers get their service through AT&T towers. So, in a way, T-Mobile customers are already sucking up AT&T's bandwidth. Once quadband UMTS chipsets become common, or T-Mobile decides to abandon its 1700mhz plans, I'm sure that AT&T and T-Mobile will reach a roaming agreement just like they did with GSM/EDGE
dieKatze88 said:
once quadband UMTS chipsets become common, or T-Mobile decides to abandon its 1700mhz plans, I'm sure that AT&T and T-Mobile will reach a roaming agreement just like they did with GSM/EDGE
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Sounds like the best plan for them to come to their senses...This would be our best hope!
This broke my heart... and I work for T-Mobile. Why on earth would HTC/SE make a phone that practically every company in the world can use with 3G, but not T-Mobile!? Frustrated.
gregnm369 said:
This broke my heart... and I work for T-Mobile. Why on earth would HTC/SE make a phone that practically every company in the world can use with 3G, but not T-Mobile!? Frustrated.
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Then why don't you blame T-mobile for building their 3G network on 2100mzh while there others are using 850/900/1900 for YEARS?
jackleung said:
Then why don't you blame T-mobile for building their 3G network on 2100mzh while there others are using 850/900/1900 for YEARS?
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AT&T is 2100mhz... T-Mobile USA is 1700mhz
Uh...ATT is 850/1900, FYI. Tmobile is 1700/2100 both, not either or.
jvs60 said:
Uh...ATT is 850/1900, FYI. Tmobile is 1700/2100 both, not either or.
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That's strange. A G1 is unlockable to ATT, but only supports UMTS 1700/2100. The G1's in our store access 3G just fine. My X1i won't access anything but EDGE (not 3G). Since the G1 supports 1700 and X1i does not, this is the logical deduction that the X1i doesn't support the same standard that the G1 does which is T-Mobile USA 3G
gregnm369 said:
Why on earth would HTC/SE make a phone that practically every company in the world can use with 3G, but not T-Mobile!?
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hmmm... let me state it upside down:
"Why on earth would T-MOBILE chose a band NOT USED BY ANY OTHER COMPANY IN THE WORLD ??"
Sounds better this way
Or... you can say it like this:
"Why on earth would HTC/SE or ANY other phone maker include in all their phones a band that is ONLY USED by T-MOBILE ??"
This one is even worst
PS: It's true, T-Mobile is the ONLY operator using the 1700+2100 martian band don't blame phone makers
And beware: it is NOT "1700 & 2100" but "1700 PLUS 2100" (one band for uplink and the other band for downlink)
SUCH A FREAK !!
gregnm369 said:
AT&T is 2100mhz... T-Mobile USA is 1700mhz
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Are you kidding me that you are working for a carrier and you don't even know what bands your company (or your competitor) is using? I am starting to understand why you would blame the phone manufacture now ....
Why would HTC/SE make a phone that practically every company in the world can use with 3G, but not T-Mobile?
Why would T-mobile chose a 3G band (1700+2100mhz) not used by any other company in the world?
It's really quite complicated, so I'll keep it simple (although the details won't be very clear).
It's neither HTC/SE nor T-mobile's fault. Unlike in Europe, the American government (FCC) does not define or reserve specific bands (1900mhz, 2100mhz, etc) for specific technologies (GSM, UMTS, CDMA, etc). The US government also does not want to reallocate bands that are already being used, even if it's for older technology. Since VoiceStream (Tmo before Deutsche Telekom bought it) didn't have any money to buy spectrum in advance for 3G, that pretty much means that T-mobile has had to settle for whatever bands are leftover.
T-mobile wanted to keep their US 3G bands the same as in Europe, but the lower half (uplink) is already occupied by another technology (which the FCC cannot or will not vacate). So the only choice was to launch 3G on the 1700+2100mhz "AWS" band, or have no 3G at all. And without 3G, AT&T would have a monopoly on UMTS, Tmo would lose business with only 2G, and we as customers would suffer in the long run (especially since without competition, AT&T could keep its prices artificially high).
For the other points, contrary to popular belief, Tmo is not the only carrier in the world that runs a UMTS network in the 1700mhz range. Carrier e-Mobile in Japan runs a UMTS 1700 network. It is slightly different than Tmo's AWS because e-Mobile uses 1700-uplink/1800-downlink (UMTS Band IX) while Tmo uses 1700-uplink/2100-downlink (UMTS Band IV) and is therefore still incompatible. However, as with the G1, it is fully possible to build a radio that can switch between "overlapping" modes (eg: 1700+2100 and 1900+2100* on the G1), it just isn't very cost-effective to make those radios at the moment.
*1900+2100 does not mean AT&T's UMTS 1900mhz network. It's 1900mhz uplink and 2100mhz downlink, and you can see the specific frequency differences here (UMTS Bands I and II).
Keep in mind (and this is a more general point): GSM started off with most phones being only dual-mode (900/1800mhz or 850/1900mhz), but after the technology matured tri- and quad-band radios became commonplace, and now quad-GSM phones are found everywhere. In time we might see a penta-band (850/900/1700/1900/2100) "global" UMTS radio become standard on all phones -- just not with the X1. Then again, by the time we see penta-radios, we will move on to 4G, and with the current split between WiMAX and LTE, we will probably have these same headaches all over again.
So if you want someone to blame, blame the FCC for being unable or unwilling to harmonize the US wireless spectrum with other global standards. Tmo, HTC, and SE are merely just trying to play the cards dealt to them.
--
You might also stop to consider: it is still possible for SE to release a Tmo-capable X1 (let's call it the X1t), but the only advantage is that it would work with Tmo, and thus only Tmo customers would buy it (unlike the X1a which can work with any 850/1900/2100mhz carrier, not just AT&T). That makes it cost-prohibitive at the moment. Furthermore, since it would be sold in the American market, the Qualcomm patent restrictions would still apply, and you would end up with the MSM7201A processor which many X1a users have been complaining about. There is just no perfect answer.
Thank you for clarifying. I learned something from that.
Maybe someone who has a better grasp of hardware can answer this question. Why would HTC make different phones for different 3G networks (not counting CDMA here, just GSM)? For instance, if you want to use a HD2 on AT&T's network, you have to get an 9193 import from Australia which uses the same 3G freq (2100), while T-mobile uses a 3G freq. of 850.
Now, the real question. Is there a real difference in the antenna hardware between the TMUSHD2 and the 9193 import? Or is it a matter of firmware which programs the antenna to listen at a certain freq?
From a manufacturing standpoint, it seems it would be simpler to make a standardized receiver section, and then just software to program it for certain frequencies depending on the cell vendor's requirements.
Any ideas?
You really need to do some homework. Your highspeed data frequencies are all mixxed up.
Telstra T9193 850+2100UMTS
European T8585 900+2100UMTS
TMOUS 1700+2100UMTS
ATT uses 850+1900UMTS so the telstra is the only one to get 3G or H in the states. The 850UMTS band alone will suffice for most.
And HTC produces so many versions because carriers around the world use different frequencies. Also it is hardware and not firmware that denotes these frequencies.
As Agoattamer stated, different carriers/regions use different frequencies for their signal (whether it's Edge/HSDPA or w/e).
But furthermore, I don't believe HTC makes any radio chips, they purchase them and then put them in their phones (kinda like snapdragon cpu is made by Qualcomm and not HTC). More so, there is no chip in existence that supports all frequencies (and it kinda makes sense; there's no need to built a chip which will cost more, and physically take up more space when only a few of it's frequencies will be used in it's lifetime depending on where it is located. Also, it allows for phones to be locked to carriers, which carriers like).
So it's not firmware locked, it's hardware based and can't be changed.
I was lamenting on my lack of foresight, getting a HD2 without researching the different bands that AT&T and T-Mobile use for 3G coverage, when just the other day...
NOTE: This was on a call to AT&T Support and the tech tells me:
a) Once unlocked from TMOUS, I should do a search on "AT&T APN's" and that if I search diligently, I will find APNs on AT&T's network that support HD2 3G Bands
b) AT&T techs, right in his data center have this working.
So I research a bit, and, apart form everyone and his brother professing to be 3G Band experts, and saying all I will see is Edge if I put the HD2 on AT&T. (Which is troublesome, since Wikipedia claims Edge is being dropped to facilitate more 3G bandwidth, so potentially I would lose even THAT).
Here is what official information I could find on the two:
The U.S. T-Mobile network predominately uses the GSM/GPRS/EDGE 1900 MHz frequency-band. T-Mobile's UMTS (3G) service is now active in over 30 major US cities
Further all official documentation states that AT&T uses:
* 850 MHz UMTS/HSPA/HSPA+ 3G
* 1900 MHz UMTS/HSPA/HSPA+ 3G
Finally look at my screenshot, taken from the GSM 3G toggle on the "Settings Tab" of Manila. I am running a NRG ROM (see signature) and I KNOW this is wishful thinking. This screen in particular is no doubt a function of the many devices NRG cooks for, but really, can anyone explain to me why this technically would NOT WORK (other than "just because", LOL)?
AT&T's CEO recently gave an interview and stated that the company's 3G service is being migrated to the 850MHz band with a target date of 2010:
http://www.intomobile.com/2009/02/24/att-3g-network-going-850mhz-nationwide-by-2010.html
For what it's worth, I think the Australian version of the HD2 might have a band that overlaps with US AT&T bands.
Whos gonna buy me one?
Mase_Mase said:
AT&T's CEO recently gave an interview and stated that the company's 3G service is being migrated to the 850MHz band with a target date of 2010:
http://www.intomobile.com/2009/02/24/att-3g-network-going-850mhz-nationwide-by-2010.html
For what it's worth, I think the Australian version of the HD2 might have a band that overlaps with US AT&T bands.
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Yes, I have been hearing the same. Problem is, I am not likely to fork out $$ for ANOTHER HD2. I just wanted to get the most out of the one I have. Thx!
if something like this WAS possible, it would have to be through something like a rogue apn setup on non-standard frequencies on ATT's network...but good luck finding anything like that, it wouldn't be able to remain a secret if it existed. also, if the hd2 had the ability to use those native frequencies, it would have had to have been certified as such by the FCC (which of course it wasn't).
To summarize, the only way to make it happen is if ATT did indeed somehow sneak in alternative-frequency apn's across it's entire network. Let us know how the search for those turns out
SmartAs$Phone said:
The U.S. T-Mobile network predominately uses the GSM/GPRS/EDGE 1900 MHz frequency-band. T-Mobile's UMTS (3G) service is now active in over 30 major US cities
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Sorry.
http://en.wikipedia.org/wiki/T-Mobile_USA
3G (UMTS/HSPA/HSPA+) service by T-Mobile exclusively uses the AWS 1700/2100 MHz frequency-band, making it incompatible with other existing 3G UMTS/HSPA networks already established in the United States.
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Its not physically possible. The hardware would have to be changed. They don't make radio chips with all the bands in it. I see this all the time, some random csr from whatever company says it can be done, but its just not true. Cell phones are designed and made for a specific company. They don't make universal radios and just turn off some bands. They don't exist, though I did read a few months back that Motorala was working on making one.
Although I understand the reason for your wishful thinking (and you did do some research which is always great), unfortunately it is just that and I'll gladly (though not happily) tell you why.
As you stated "U.S. T-Mobile network predominately uses the GSM/GPRS/EDGE 1900 MHz frequency-band" which is correct (and it also uses the 850 band for edge as well....though this is usually more 'roaming' aka you're using another companies cell tower because tmobile made a contract with them to allow you). You were also correct in stating that "Further all official documentation states that AT&T uses:
* 850 MHz UMTS/HSPA/HSPA+ 3G
* 1900 MHz UMTS/HSPA/HSPA+ 3G"
Also, ironcroth was also correct in quoting that "3G (UMTS/HSPA/HSPA+) service by T-Mobile exclusively uses the AWS 1700/2100 MHz frequency-band" which alone might not answer your question.
So where is the problem if both use 1900 and 850 bands? Well, the problem is that in the hardware, there is a difference between GSM/GPRS/EDGE and 3G/UMTS/HSPA/HSPA+. In other words, you can't use 1900 and 850 Edge frequency of the HD2's radio chip to get 3G (UMTS/HSPA/HSPA+); they are incompatible. This is why phone spects always list both seperatly and not just all the frequencies that it supports.
The above reason alone will make the TmoUSA HD2 incompatible with AT&T's 3G, but there's even more. When Tmobile says that it uses the (for example) 1900 frequency band for Edge, it doesn't actually mean that it uses 1900-1999 frequencies; instead it only uses a part of that spectrum (buying the full 100 frequency range would be expensive so they only buy what they need). Instead they only use maybe something like 1943-1978. And this range will likely not overlap with the frequncies that AT&T uses for their 3G (you can look up the exact values on the internet if you'd like). This second reason is why a european phone which supports 2100 band for 3g will not work on Tmobile's 3G 2100 frequncy (because they don't actually overlap).
Lastly (and I almost forgot to mention this), the screen shot you posted from your ROM can indeed be changed by a cook to whatever they want (though it won't actually make any difference since it all depends on the hardware). However, in this case, it's likely because htc actually made the error and never updated that screen and just used it from their previous builds from previous phones (this was stated on the forums before and I'm sure you'd be able to find it given some searching).
Hope this helps.
sirphunkee said:
To summarize, the only way to make it happen is if ATT did indeed somehow sneak in alternative-frequency apn's across it's entire network. Let us know how the search for those turns out
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Quite unlikely, the AWS bands are licensed to TMO, im sure TMO would notice real quick if there were unlicensed cell towers on the AWS band and the FCC would be slapping ATT with fines pretty quick. quite alot of work goes into setting up cell towers and the frequencies each cell segment runs on, If a rouge cell tower went up overlapping TMO's frequencies, all hell would likely break loose as far as customers being able to get usable service in the area.
also as far as the terminology APN's don't operate on a "frequency" an APN is more or less and authentication/proxy server on the data network after the data has transferred over the air interface.
Maybe the best way to think of it is similar to a cell tower being like a wifi access point, and the APN being like an authenticating router/firewall on a standard tcp/ip network. yeah i know its not quite the same, but that might be a simple way to visualize it for those familiar with networking
d0ug said:
Quite unlikely, the AWS bands are licensed to TMO, im sure TMO would notice real quick if there were unlicensed cell towers on the AWS band and the FCC would be slapping ATT with fines pretty quick. quite alot of work goes into setting up cell towers and the frequencies each cell segment runs on, If a rouge cell tower went up overlapping TMO's frequencies, all hell would likely break loose as far as customers being able to get usable service in the area.
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Exactly
d0ug said:
also as far as the terminology APN's don't operate on a "frequency" an APN is more or less and authentication/proxy server on the data network after the data has transferred over the air interface.
Maybe the best way to think of it is similar to a cell tower being like a wifi access point, and the APN being like an authenticating router/firewall on a standard tcp/ip network. yeah i know its not quite the same, but that might be a simple way to visualize it for those familiar with networking
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Right, very true...I should have said "apn's attached to alternative-frequency radios" Are you a Ham d0ug?
sirphunkee said:
Exactly
Right, very true...I should have said "apn's attached to alternative-frequency radios" Are you a Ham d0ug?
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Haha no, though i do have scanners and listen in on HAMs sometimes and have read up on the stuff somewhat. never gotten myself licensed.
On the subject of scanners, there isnt all that much interesting to listen too anymore. Here in tampa the police and sheriff are on analog trunked now, so its impossible to follow anything without a trunking scanner, and about the only other things you can listen to are cabbies, tow truck drivers, aircraft, and hams. I don't even know why scanners still have the 800mhz blocks anymore, analog amps cellular has been dead a few years now. you find lots of digital noise scanning around though, just about everything is transmitted digitally now. i've got an icom R20 that goes from 150khz all the way upto 3ghz
So why don't you put in an AT&T sim card with a 3G data plan and let us know if you get 3G on your HD2?
Svegetto said:
Although I understand the reason for your wishful thinking (and you did do some research which is always great), unfortunately it is just that and I'll gladly (though not happily) tell you why.
As you stated "U.S. T-Mobile network predominately uses the GSM/GPRS/EDGE 1900 MHz frequency-band" which is correct (and it also uses the 850 band for edge as well....though this is usually more 'roaming' aka you're using another companies cell tower because tmobile made a contract with them to allow you). You were also correct in stating that "Further all official documentation states that AT&T uses:
* 850 MHz UMTS/HSPA/HSPA+ 3G
* 1900 MHz UMTS/HSPA/HSPA+ 3G"
Also, ironcroth was also correct in quoting that "3G (UMTS/HSPA/HSPA+) service by T-Mobile exclusively uses the AWS 1700/2100 MHz frequency-band" which alone might not answer your question.
So where is the problem if both use 1900 and 850 bands? Well, the problem is that in the hardware, there is a difference between GSM/GPRS/EDGE and 3G/UMTS/HSPA/HSPA+. In other words, you can't use 1900 and 850 Edge frequency of the HD2's radio chip to get 3G (UMTS/HSPA/HSPA+); they are incompatible. This is why phone spects always list both seperatly and not just all the frequencies that it supports.
The above reason alone will make the TmoUSA HD2 incompatible with AT&T's 3G, but there's even more. When Tmobile says that it uses the (for example) 1900 frequency band for Edge, it doesn't actually mean that it uses 1900-1999 frequencies; instead it only uses a part of that spectrum (buying the full 100 frequency range would be expensive so they only buy what they need). Instead they only use maybe something like 1943-1978. And this range will likely not overlap with the frequncies that AT&T uses for their 3G (you can look up the exact values on the internet if you'd like). This second reason is why a european phone which supports 2100 band for 3g will not work on Tmobile's 3G 2100 frequncy (because they don't actually overlap).
Lastly (and I almost forgot to mention this), the screen shot you posted from your ROM can indeed be changed by a cook to whatever they want (though it won't actually make any difference since it all depends on the hardware). However, in this case, it's likely because htc actually made the error and never updated that screen and just used it from their previous builds from previous phones (this was stated on the forums before and I'm sure you'd be able to find it given some searching).
Hope this helps.
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Click to collapse
Thank you very much. I myself had been wondering why I couldn't get an HTC Desire (honestly, pretty much the only phone I'd change my HD2 for unless a GSM version of the Supersonic becomes available) and have it work in the US at the 2100 frequency.
When I asked before, people would tell me that a phone would have to support both bands (1700/2100) to actually run on T-Mobile because one did HSDPA and the other did HSUPA, but that didn't make sense to me since all you need is a single band frequency to handle both D and U data streams.
Your explanation makes a lot more sense. It's a sad thing, though.
I remember reading somewhere that a chip manufacturer (motorola?) was working on a all frequency chip. I also read that the inherent problem with that would be the antenna.
It would be awesome to have an all band phone that world travelers could utilize. I love the HD2, I had upgraded from a long time use of a Treo 750. That phone was pretty close (quad GSM, triple umts). However when Tmo rolled out it's 3G on 1700 I was still stuck on edge with the 750.
Finally bit the bullet for an HD2, really like this phone. The 750 seems antique now heheh
moonchaser said:
I remember reading somewhere that a chip manufacturer (motorola?) was working on a all frequency chip. I also read that the inherent problem with that would be the antenna.
It would be awesome to have an all band phone that world travelers could utilize. I love the HD2, I had upgraded from a long time use of a Treo 750. That phone was pretty close (quad GSM, triple umts). However when Tmo rolled out it's 3G on 1700 I was still stuck on edge with the 750.
Finally bit the bullet for an HD2, really like this phone. The 750 seems antique now heheh
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Building a multi frequency chip isnt all that hard. software defined radios have existed for quite some time. basically a simple reprogramming allows it to xmit/rec on a different frequency. the trouble comes in the antenna design. antennas must be designed to work at specific frequencies to be the most efficient at transmitting and the most sensitive at receiving. trying to make a single antenna capable of xmit and rec anywhere in a bandwidth ranging from 700mhz upto say the 2500mhz that wimax uses, is going to make for quite a ****ty antenna at any frequency. When you see the piece of foil antennas in todays phones, they may just look like a simple piece of foil, but a lot of design goes into them to make them work well at the frequencies they need to work with.
I guarantee if you compared the internal antenna of the Euro, AUS and USA HD2 there are slight differences. Ill bet the radio chip in them is for the most part identical, there may be something modified on them to keep people from interchanging the radio roms between them though since that would invalidate any FCC or other country equivalent certification for that phone to operate
Its one thing to run a hacked rom, its something completely different to use an uncertified radio rom. Could cause all kinds of havoc with the cellular network, and get slapped with FCC fines if they could track down your trouble causing phone
d0ug said:
Building a multi frequency chip isnt all that hard. software defined radios have existed for quite some time. basically a simple reprogramming allows it to xmit/rec on a different frequency. the trouble comes in the antenna design. antennas must be designed to work at specific frequencies to be the most efficient at transmitting and the most sensitive at receiving. trying to make a single antenna capable of xmit and rec anywhere in a bandwidth ranging from 700mhz upto say the 2500mhz that wimax uses, is going to make for quite a ****ty antenna at any frequency. When you see the piece of foil antennas in todays phones, they may just look like a simple piece of foil, but a lot of design goes into them to make them work well at the frequencies they need to work with.
I guarantee if you compared the internal antenna of the Euro, AUS and USA HD2 there are slight differences. Ill bet the radio chip in them is for the most part identical, there may be something modified on them to keep people from interchanging the radio roms between them though since that would invalidate any FCC or other country equivalent certification for that phone to operate
Its one thing to run a hacked rom, its something completely different to use an uncertified radio rom. Could cause all kinds of havoc with the cellular network, and get slapped with FCC fines if they could track down your trouble causing phone
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Click to collapse
Yeah that's on par with what I had read, you do well at explaining it.
Maybe some futuristic worldphone designer would opt for interchangeable external antenna's... I could live with that or maybe multiple builtin foils with a software driven switch between them and the radio... that would be neat. Not holding my breath though...
Interesting on the FCC, hadn't thought of that.
moonchaser said:
Yeah that's on par with what I had read, you do well at explaining it.
Maybe some futuristic worldphone designer would opt for interchangeable external antenna's... I could live with that or maybe multiple builtin foils with a software driven switch between them and the radio... that would be neat. Not holding my breath though...
Interesting on the FCC, hadn't thought of that.
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Thanks, I was just again looking at the spec differences between the euro and TMO HD2s and i really don't know why HTC did not also give the TMO HD2 850/900mhz HSPA/WCDMA to truly make it a world 3G phone. According to the tech specs over at HTC.com, TMO HD2 can already use 850/900mhz for GSM/GPRS/EDGE so the antenna is obviously quite capable of both. The only other frequency the TMO HD2 has to handle that the euro doesn't is 1700mhz
Part of me thinks it was probably done so the HD2 couldn't be used over on AT&T
d0ug said:
Thanks, I was just again looking at the spec differences between the euro and TMO HD2s and i really don't know why HTC did not also give the TMO HD2 850/900mhz HSPA/WCDMA to truly make it a world 3G phone. According to the tech specs over at HTC.com, TMO HD2 can already use 850/900mhz for GSM/GPRS/EDGE so the antenna is obviously quite capable of both. The only other frequency the TMO HD2 has to handle that the euro doesn't is 1700mhz
Part of me thinks it was probably done so the HD2 couldn't be used over on AT&T
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Click to collapse
It had nothing to do with AT&T, it's because there's a difference between Edge and 3g radio frequency. More than that, there is no phone radio chip that supports all those frequencies and even more so, htc doesn't manufacture radio chips, they purchase them and put them in their phones....just like the majority of the hardware
Srs wow hd
How do you get SRS WOW HD downloaded onto the HTC HD2?
Svegetto said:
a european phone which supports 2100 band for 3g will not work on Tmobile's 3G 2100 frequncy
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Click to collapse
I think this is incorrect -- the 2100 band support on the HD2 is in fact expressly intended for 3G compatibility in Europe/Asia, and people have reported being able to get 3G in Europe with their US HD2.
1700 == US-only 3G
2100 == Europe, Asia 3G
What's missing, I believe, might be 3G support in certain areas of places like Latin America which may follow US frequencies but don't have T-Mobile USA there to provide 1700 service... e.g., no 2100 and no 1700 either.
T-Mobile U.S. uses both AWS 1700mhz and 2100mhz for 3G. The 2100mhz band is used for transmit and 1700mhz is used for receive. Hence the incompatibility with other carriers phones that only operate in one spectrum.
Cheers.
~Jasecloud4
T-Mobile recently acquired a lot of low band spectrum that is supposed to improve reception inside buildings. They say that the T-mobile phones that will be able to take advantage of this spectrum will only be available later this year.
How does it work with spectrum and unlocked non-carrier specific or international versions? Are they compatible with low band spectrum? How can one find out?
I believe it's the 600mhz spectrum and V20 I don't think has the right antenna to use it. As far as I know not even The s8 has it
railshot said:
T-Mobile recently acquired a lot of low band spectrum that is supposed to improve reception inside buildings. They say that the T-mobile phones that will be able to take advantage of this spectrum will only be available later this year.
How does it work with spectrum and unlocked non-carrier specific or international versions? Are they compatible with low band spectrum? How can one find out?
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Most likely you're thinking of band B12/700MHz. From checking that site, many of the LGE V20s include that band (both US996 and H918).
No idea what band is gonna be used but I did read about T-Mobile acquiring the 600Mhz spectrum. Unfortunately our v20s won't be compatible. More than likely will only incorporate phones made later this year.
railshot said:
T-Mobile recently acquired a lot of low band spectrum that is supposed to improve reception inside buildings. They say that the T-mobile phones that will be able to take advantage of this spectrum will only be available later this year.
How does it work with spectrum and unlocked non-carrier specific or international versions? Are they compatible with low band spectrum? How can one find out?
Click to expand...
Click to collapse
We will not be able to make use of 600mhz spectrum on any device "To say the least" older then the Note 8 "Presumably the first phone to have 600mhz capable hardware in the coming months"
I find it strange that no V20 is able to utilize 600 MHz spectrum. It was my understanding that until now, other carriers such as ATT did have 600 MHz spectrum. It was just T-Mobile that was deficient. So should not a non-carrier specific phone, or an international model have hardware to use it?