Develop Bugs

[Q] G2 on AT&T?

Hey guys, new to Android and T-Mobile. I got a G2 last week, and I live and work in kind of a fringe area for T-Mo coverage. AT&T has good coverage out here, but the G2 doesn't roam over to ATT, I can't even register on their system when I select it in the mobile networks settings. My question is- how can I set the phone to roam onto their system when I lose T-Mo coverage? (I have heard that T-Mo can roam to ATT on EDGE). Thanks!

As far as I know, the only way to use AT&T on the G2 would be to SIM unlock the phone and use an AT&T SIM with an AT&T account. The TMO SIM won't just allow you to roam because they don't have a reciprocal billing agreement --- though I am no expert on this.
I believe, though I could be wrong, that the G2 does not have the ability for 3G (UMTS) data on AT&T. As you stated, if you could connect to the network, Edge should work.
One solution would be to switch to an AT&T SIM and use the Samsung Vibrant, which has the ability to connect to one of the two AT&T 3G bands. Of course, if you want to use AT&T regularly, getting an AT&T phone would be a better solution. So, for you, unless you want to switch to AT&T, wifi might be your only solution.

Ugh! That is exactly what I was hoping I wouldn't read lol. Well, I do really want to stick with tmo, just wish my phone would auto roam to att when I lose the tmo signal. Thanks for the reply!
Sent from my G2 using XDA app

I asked around at work a bit, and there are cases where you can roam on AT&T's network. These cases exist in areas where T-Mobile has not, cannot, or will not build out a network. In these cases, they contract with AT&T to provide their customers with network access. Some phones will show roaming, but I think the software, at this point, has made it a seamless experience, and you don't even know you are attached to AT&T's network. For billing, purposes, if you have a national plan, you are not roaming.
This doesn't help you, but I wanted to clarify my blanket statement above.

Check out the coverage map (Select NO for Are you a Rep, then go to the Data Coverage Map):
compass(DOT)t-mobile(DOT)com
Unfortunately in your area of CA, there is no roaming partner.
The only roaming in CA is in some parts of N. CA up Hwy 1 and 101, towards the Oregon border, and in the 395 corridor.

I'm thinking of upgrading from my HTC Rhodium on ATT to a Desire Z (also on ATT). Is there anything I should be looking for to make sure it will play nice with the 3G network?
Thanks
nnvpears

nnvpears said:
I'm thinking of upgrading from my HTC Rhodium on ATT to a Desire Z (also on ATT). Is there anything I should be looking for to make sure it will play nice with the 3G network?
Thanks
nnvpears
Click to expand...
Click to collapse
You'll need to buy the Canadian version of the DZ (from Bell Mobility).

manual select available cellular networks?

hello,
can you guys pick up different signal carrier in your hd7?
i am using T-mobile HD7 and the signal is not stable in my place (i have few drop calls). the Verizon signal is much better and i can pick it up from this menu >start>setting>cellular>network selection>
I can force the phone using Verizon, but the problem is after the choosing, the cellphone did not show any signal bars. <most likely phone can not register in the network>. it is wired. any ideas?

tmobile phones cannot use cdma networks, different radios, different technologies.

can a AT&T or cellular network be used in this phone? t-mobile signal is so terrible in my place.

maopost said:
can a AT&T or cellular network be used in this phone? t-mobile signal is so terrible in my place.
Click to expand...
Click to collapse
yes you can use at&t if you sim unlock your phone. T-mobile might do it for you or you can pay one of the web based companies that do it.
You won't have 3g though.
Why did you get a t-mobile phone if you don't have t-mobile reception???

nope. AT&T work off different network signal than the others do so you won't have much luck. and i'm not sure if the HD7 from t-mobile supports the band (network signal) that AT&T uses. so you could try but i highly doubt it.

t-mobile signal is not good in my place.
to be honest with you, I hate AT&T and verizon.

Possible to get Galaxy Nexus to work on Sprint?

I want to know if this is possible at all, does anyone know of any ways to put a verizon phone on sprints network? I think it has been done before, I will buy this phone if I can get 3g to work on sprint

Nope, VZW and Sprint operate at 2 different frequencies AND if you could somehow do it I don't think Sprint allows Third Party/Unlocked Phones.

actually they are teh same frequencies. how else would our roaming on verizon's network work?

shakuyi said:
actually they are teh same frequencies. how else would our roaming on verizon's network work?
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Yea I actually think you are right because verizon and sprint share a tower here in Virginia. But sprint would never allow it.
Sent from my Galaxy Nexus using XDA App

I've been told different things by different reps at different Sprint locations. One guy in-store told me that it's "very possible" but that the customer has to do all the unlocking, etc. Another rep at one of their call centers reiterated the same. "If you unlock it, we can do it. Otherwise, there's nothing we can do."
So the question remains, how can we unlock it? I'd LOVE to stay with Sprint. Does anyone have expertise in this area? I've seen a few threads on this and they all seem to go unanswered...wondering if it's not a popular topic or if it's something we shouldn't be discussing?
Thanks!

Run around clockwise half naked below freezing while chanting "goosfrabah"...
Seriously no need to be posting such a thread. It's been posted and debated and talked about. Google and such should be your friend.
Either make googley eyes (and maybe much "more") at someone deep inside Sprint to add a VZW ESN to their database, NOT GOING TO HAPPEN, or murk in the underworlds of ESN cloning and modification, NOT HAPPENING HERE on XDA...

Posting from another thread.
No, the ESNs are in a computer database. If the rep enters an incorrect ESN or, in this case from their point of view invalid, the system will not move forward.
Even if that wasn't the case, I don't believe Verizon and Sprint operate on the same CDMA frequencies. Not to mention LTE. EVEN if that wasn't the case, the Galaxy Nexus pulls its subscriber information(like the phone number, data plan, etc) from its SIM card(just like GSM phones).
Sent from my Galaxy Nexus

http://phandroid.com/2011/12/20/spr...e-given-the-green-light-for-activation-rumor/
Possible, YES. Depends only on if sprint want to activate it or not. Phones generally support the entire spectrum and not just the subset that carrier uses.
For example on GSM, phones either support ALL of the 900 spectrum or none of it. The fact that the spectrum is split in two and used by different operators doesn't make a difference - thats just handled by the simlock/Activation of ESN.
It wouldn't make much sense for a hardware manufacturer to cripple a radio baseband to part of the spectrum if it can handle all of it, otherwise they would need to make new mainboards for each operator.
LTE is a different situation. As the spectrum is not split, and each operator use an entirely different spectrum. It would be more costly to add other spectrums on a Verizon device with no real benefit, if they have no plans to offer it on any other operator. Also it may be more cost or design effective to make two different boards if for example they can't fit an antenna that can handle both frequencies.

unremarked said:
Posting from another thread.
No, the ESNs are in a computer database. If the rep enters an incorrect ESN or, in this case from their point of view invalid, the system will not move forward.
Even if that wasn't the case, I don't believe Verizon and Sprint operate on the same CDMA frequencies. Not to mention LTE. EVEN if that wasn't the case, the Galaxy Nexus pulls its subscriber information(like the phone number, data plan, etc) from its SIM card(just like GSM phones).
Sent from my Galaxy Nexus
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VZW and Sprint operate on the same CDMA frequencies, 1x CDMA 2000 and 3G. How else do Sprint and VZW roam off each other for voice and data? When it comes to 4G, that's where they differ, LTE vs WiMax (for now). Even when Sprint goes LTE, they'll be running on a different LTE frequency than VZW and AT&T, so LTE roaming shouldn't be on anyone's radar for the foreseeable future.
And NO, the VZW GNex does not pull "its subscriber information (like the phone number, data plan, etc) from its SIM card(just like GSM phones)." Subscriber info is pulled from the ESN/MEID unique to any CDMA phone (VZW and Sprint included) to authenticate on the network. The SIM in VZW LTE phones is for LTE purposes ONLY, 4G data only and nothing else.

Why dont you get the galaxy s II? Wish I could get it for Verizon

LordLugard said:
VZW and Sprint operate on the same CDMA frequencies, 1x CDMA 2000 and 3G. How else do Sprint and VZW roam off each other for voice and data? When it comes to 4G, that's where they differ, LTE vs WiMax (for now). Even when Sprint goes LTE, they'll be running on a different LTE frequency than VZW and AT&T, so LTE roaming shouldn't be on anyone's radar for the foreseeable future.
And NO, the VZW GNex does not pull "its subscriber information (like the phone number, data plan, etc) from its SIM card(just like GSM phones)." Subscriber info is pulled from the ESN/MEID unique to any CDMA phone (VZW and Sprint included) to authenticate on the network. The SIM in VZW LTE phones is for LTE purposes ONLY, 4G data only and nothing else.
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Click to collapse
Thanks for the clarification on the frequencies thing. I wasnt 100% sure what Sprint operated on.
As for the SIM, I am 100% sure. Trade SIM cards with a friend, even to another microSIM device like a Samsung Stratosphere Restart your phone and then call eachother. The numbers will be swapped. Heck, even easier. Yank your SIM out and make a test call or check under the About Phone options.
EDIT: I know that Sprint uses CDMA(1x) and EVDO(3G). But what bands do they operate on? Just like AT&T and T-Mobile use GSM(aka edge) and HSPA(3G) but on different bands so not all their phones are entirely cross compatible.
EDIT2: Found my own answer. VZW operates on 850mhz, and 1900mhz. Sprint is 800mhz and 1900mhz. So you may in theory use a 3G Verizon phone on Sprints network with limited capability. I'd imagine it would be just like if you put an ATT iPhone on T-Mobile and be able to make calls but only get 2G.
Regardless of the frequencies you still have the ESN lockout as well as the SIM card issue.
Sent from my Galaxy Nexus

Sprint not going to activate the phone no matter what you do.

CDMA carriers have the last say so of what goes on their network and what does not. They chose what you use not you. They base the their phones off of the ESN/MEIDs if those do not match up to a "clean" one in their system then no go. Its their way of forcing contracts, "if you have to get a sprint phone may as well get the contract with it." they thing. GSM on the other hand you can do it because the identification of the carrier is on the SIM card rather then the phone. However, some carriers will "flash" a phone over like Criket or metro pcs (however they can brick the phone and then you can't even do anything with it.)

MetroPCS lets you bring in any CDMA phone and activate it on their network. I'm sure sprint could do the same if they wanted to.

tommyz2kool said:
MetroPCS lets you bring in any CDMA phone and activate it on their network. I'm sure sprint could do the same if they wanted to.
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Emphasis on "IF THEY WANTED TO." If past behavior is indicative of the future then reason says they don't.
Lets assume Sprint suddenly changes its mind after years of hemorrhaging customers and move beyond that, as I've previously said the Galaxy Nexus(and all 4G LTE phones) behave more like GSM phones than CDMA and pull their subscriber information from the SIM card. Don't believe me? Try to use your VZW Galaxy Nexus without your SIM. Mine didn't work. Further my theortical point about the supported bands still stand. Who wants a Galaxy Nexus on 1X data?
Sent from my Galaxy Nexus

I thought that Sprint was going to offer the Gnex at some point. Was I just dreaming that? Does anyone know if Sprint is going to get the GN?
I could have sworn I heard that Sprint was getting it somewhere....

unremarked said:
Emphasis on "IF THEY WANTED TO." If past behavior is indicative of the future then reason says they don't.
Lets assume Sprint suddenly changes its mind after years of hemorrhaging customers and move beyond that, as I've previously said the Galaxy Nexus(and all 4G LTE phones) behave more like GSM phones than CDMA and pull their subscriber information from the SIM card. Don't believe me? Try to use your VZW Galaxy Nexus without your SIM. Mine didn't work. Further my theortical point about the supported bands still stand. Who wants a Galaxy Nexus on 1X data?
Sent from my Galaxy Nexus
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The reason your LTE VZW phone will not work without the SIM has nothing to do with pulling subscriber info but more to do with just authenticating with the LTE network, period.
Once again, your subscriber info is more hard coded to your ESN/MEID.
The LTE network could go down (like it has done now several times) and your phone will work fine with CDMA voice and 2G/3G. If the CDMA network goes down then you're screwed because all authentication starts there.
Sent from my SPH-D710

bradm23 said:
Why dont you get the galaxy s II? Wish I could get it for Verizon
Click to expand...
Click to collapse
That.
+1 char

LordLugard said:
The reason your LTE VZW phone will not work without the SIM has nothing to do with pulling subscriber info but more to do with just authenticating with the LTE network, period.
Once again, your subscriber info is more hard coded to your ESN/MEID.
The LTE network could go down (like it has done now several times) and your phone will work fine with CDMA voice and 2G/3G. If the CDMA network goes down then you're screwed because all authentication starts there.
Sent from my SPH-D710
Click to expand...
Click to collapse
I'd love to hear your explaination for the following behaviors. The only thing I changed was I took out my SIM card. You'll notice now even the time is wrong since the phones sync their time with the carrier.
EDIT: removed pictures because I'm paranoid/OCD about personal info.

You can post as many pics as you want. Your "subscriber info" is tied to your esn/meid in the system. Without those, whether you have an LTE sim or not on a CDMA network like VZW, your phone will not function. The LTE sim doesn't handle voice or any calling functions, just data.
When your phone connects to a cell tower (or the network), certain parameters are sent for a sort of handshake, which are your esn/meid.
I think you need to better familiarize yourself with the fact that VZW is a CDMA network first and foremost (and with all that entails, esn/meid/msid etc) with an LTE based data-only network (for now) built alongside it.
Sent from my SPH-D710

[Q] at&t 4g on unlocked tmobile galaxy s3??

I have a unlocked t mobile galaxy s3 I'm using on at&t network and I only get 3g but my download speeds are 4 to 5 mb. Which is pretty decent but I was wondering if there was a way to get AT&T 4g? Maybe it's my apn setting issue? Any tips.....

What data plan are you on (medianet/dumb phone, fauxG, LTE)? I've rarely had issues with my unlocked phones having the wrong APN on AT&T, but here are the APNs: medianet is wap.cingular, 4G/HSPA+ is phone, and 4G LTE is pta.
That's about what I get on medianet. I've got as high as 8Mbps on pta but it varies and it's never been consistent for me. 3-5Mbps is normal for my HSPA+ in my area (Olympia, WA). I get about the same speeds in southern CA and tended to get better speeds by 1-2Mbps in Austin, TX.
If you're asking if it's possible to get LTE on the T999, I have no idea. ;P The MSM8960 (S4 SoC in both phones) does support it natively but I don't know if it's possible to enable the LTE modem in software. You could try flashing an AT&T modem but I doubt it's that simple.

Ok maybe I'm wrong but isn't the t-mobile galaxy s3 the only one that didn't come lte equipped because t-mobile uses hspa+?
Sent from my SPH-L710 using xda app-developers app

how did you unlock, I got the unlock code from cellunlockers but after following all the different instructions in their email it sill won't unlock

Rev3ge07 said:
Ok maybe I'm wrong but isn't the t-mobile galaxy s3 the only one that didn't come lte equipped because t-mobile uses hspa+?
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
That is correct. It uses HSPA+ 42
Sent from my GT-I9300 using Tapatalk 2

teiglin said:
What data plan are you on (medianet/dumb phone, fauxG, LTE)? I've rarely had issues with my unlocked phones having the wrong APN on AT&T, but here are the APNs: medianet is wap.cingular, 4G/HSPA+ is phone, and 4G LTE is pta.
That's about what I get on medianet. I've got as high as 8Mbps on pta but it varies and it's never been consistent for me. 3-5Mbps is normal for my HSPA+ in my area (Olympia, WA). I get about the same speeds in southern CA and tended to get better speeds by 1-2Mbps in Austin, TX.
If you're asking if it's possible to get LTE on the T999, I have no idea. ;P The MSM8960 (S4 SoC in both phones) does support it natively but I don't know if it's possible to enable the LTE modem in software. You could try flashing an AT&T modem but I doubt it's that simple.
Click to expand...
Click to collapse
Hey I have a question regarding this topic and the quote above. You listed the Apn's with its respective data plan:
1. wap.cingular = non-smartphone (i'll refrain myself from calling it a dumb phone plan lol).
2. Phone = 4G/H+
3. LTE = PTA
So I've just switched over from IPhone 4s > HTC One X > to now the Samsung Galaxy S3 (International unlocked version).
When I switched sims from iphone to one x, my data wouldnt work so they told me to get an LTE sim and give them the imei # of the ONE x. So i did that and everything was fine. They updated my account and i was receiving LTE on the phone with no issues.
NOW, with my galaxy, i just stuck the LTE sim in the phone and the phone defaulted to the cingular 410 apn. This is same as wap.cingular.
So here are my questions:
1. Would it be beneficial (from a performance/data speed standpoint) for me to call AT&T and tell them I'm back to a NON-LTE phone and have them change my account to a non-LTE account? And go through the process of changing my imei # in their system again also?
2. Since I'm actually on a smartphone unlimited (i did not take advantage of the $10/mo medianet) should I change my APN settings to "PHONE" and not use what the S3 defaulted me to?
3. Whats the actual difference in using wap vs phone APN's... I know the settings themselves are different, but anybody know the technical differences?
Thanks so much in advance!

T-mobile galaxy S3 on ATT 4G network
Hello can anyone post pics of the Galaxy S3 (T999) the t mobile version on ATT 3g or 4g networks. I am thinking about buying it but wanna be sure that it works before i spend the big bucks

This guy confirmed it works:
http://forum.xda-developers.com/showpost.php?p=27984139&postcount=28
Anyone else have such luck?

I'm having this exact problem. I have an unlocked T Mobile S3 that I want to use on the AT&T network. Phone, text and VM work fine although AT&T hasn't figured out how to give me data service in any form. They're all stumped by this.
What I really need help with is coaching AT&T through the process.

Unlocked AT&T S3 I747 for MetroPCS/TMobile

Has anyone here bought an unlocked AT&T S3 to use on the MetroPCS/Tmobile network? If so has there been any issues? shorter battery life, bad connectivity?
I am debating getting the S3 unlocked or HTC One S. I would prefer the HTC One S but it doesn't have microSD slot

I have a SGH T999 Lte at&t branded unlocked and use on TMobile with the T999L lte rom with no ill effects.
Sent from my SGH-T999L using XDA Premium 4 mobile app

afwolfpacked said:
I have a SGH T999 Lte at&t branded unlocked and use on TMobile with the T999L lte rom with no ill effects.
Sent from my SGH-T999L using XDA Premium 4 mobile app
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Is that the same model as my phone? So it would be advisable, after I got the S3 to flash it with a MetroPCS ROM after activation by Metro?
I thought there would be no need of a flash if I got an unlocked phone.

edo101 said:
Has anyone here bought an unlocked AT&T S3 to use on the MetroPCS/Tmobile network? If so has there been any issues? shorter battery life, bad connectivity?
I am debating getting the S3 unlocked or HTC One S. I would prefer the HTC One S but it doesn't have microSD slot
Click to expand...
Click to collapse
You will have issues with 3G HSPA+ on 1700mhz, but 2G EDGE & 4G LTE will work just fine. If you live in a large metro area with a lot of LTE coverage it will be fine. I just went through this with my wife's phone, she had to have the Red one (AT&T specific).
edo101 said:
Is that the same model as my phone? So it would be advisable, after I got the S3 to flash it with a MetroPCS ROM after activation by Metro?
I thought there would be no need of a flash if I got an unlocked phone.
Click to expand...
Click to collapse
There is no need to flash anything, just unlock it and add/edit the APN for TMo.

DJ_SpaRky said:
You will have issues with 3G HSPA+ on 1700mhz, but 2G EDGE & 4G LTE will work just fine. If you live in a large metro area with a lot of LTE coverage it will be fine. I just went through this with my wife's phone, she had to have the Red one (AT&T specific).
There is no need to flash anything, just unlock it and add/edit the APN for TMo.
Click to expand...
Click to collapse
Sweet thanks! Both areas that I frequent have 4G and LTE coverage. My only concern is when I'm driving long distances which I often do, being in college and losing 2G signal in the middle of no where. So far with my Metro phones, I haven't seen anywhere I had 3G coverage. its always 2G and 4G/LTE

edo101 said:
Sweet thanks! Both areas that I frequent have 4G and LTE coverage. My only concern is when I'm driving long distances which I often do, being in college and losing 2G signal in the middle of no where. So far with my Metro phones, I haven't seen anywhere I had 3G coverage. its always 2G and 4G/LTE
Click to expand...
Click to collapse
Good, that is exactly what we are seeing as well. Mostly LTE coverage with EDGE to fallback on. Most all Metro areas and major highways/interstates will have good coverage. Funny enough we live in the middle of nowhere, but there is a major highway nearby so we get LTE coverage.
On a side note, US carriers marketed HSPA as 3G and HSPA+ as 4g, but both are technically 3G. True 4G is LTE. I am not sure if Metro ever had HSPA service, I think that they were just CDMA then later added LTE and have been migrated to TMo's GSM/HSPA network which now uses Metro's LTE as well. Only the newer GSM Based phones would connect to HSPA.

I have my s3 i747 unlocked an on metro I cannot get no data

banks2878 said:
I have my s3 i747 unlocked an on metro I cannot get no data
Click to expand...
Click to collapse
Check your APN settings.

i cant even get to the apn's when i goto more network then mobile networks it says insert Sim card to access network services but calling an text work fine

banks2878 said:
i cant even get to the apn's when i goto more network then mobile networks it says insert Sim card to access network services but calling an text work fine
Click to expand...
Click to collapse
What firmware are you running?
Sent from my SGH-T999 using Tapatalk

4.3 rooted.. I got data now that I flashed a modem but its very slow datai don't know how to find the right 1..heres what the one I downloaded is called modem_CWM_I747UCUEMJB

Define Slow data please. Post Speed test results.

normally around 0.15mbs but sometimes it works great and I get around 15.00mbs

Given this is not an LTE device, that sounds about right. Weather, tower congestion do affect results.

Perseus71 said:
Given this is not an LTE device, that sounds about right. Weather, tower congestion do affect results.
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The I747 is an LTE device, my wife's (running on TMo) works just fine on LTE, just not HSPA+ 1700MHz. I'll run speed test if people would like.

Unlocked att siii will not access metro/t-mobile data
Can someone verify for me what the correct apn settings are? Should there be a network operator? And since I think the apn is finally right, do you have any more suggestions? Also, do you know if this is CDMA or GSM?

can I ask why people want to buy an ATT phone to use on a Tmobile carrier? On the S4 and Note versions, people buy Tmobile phones and use them on ATT, myself included. This is because of the bootloader, and the Tmobile phones cover ATT LTE channels while not the opposite.

Wasn't planned
I didn't intentionally set out to buy an AT&T phone, I was just looking to upgrade and this was the best deal. Or at least it looked to be on the surface. Do I just need to forget it and try to sell it?

If you are in an area recently upgraded by T-Mobile, the I747 will work just fine. However, if you are in an are not upgraded with LTE, etc, it's waay more trouble than its worth. The above post about not getting HSPA+21/42 is worth considering too though.
T-Mobile and AT&T are both GSM networks btw.
Sent from my SAMSUNG-SGH-I747 using Tapatalk

I am actually on Metro P.S, but they are on the T-mobile network now in Atlanta, Ga where I live. We do run 4glte,but so far the fastest mine will connect to shows "E" on my phone, edge maybe? One of the many I've spoken with at metro said E is 3g. One of their repair techs said I needed a different SIM card because I had a CDMA phone but when I got to the store that had one he said it was a GSM phone. It's already about been more trouble than it is worth, but as much effort as I've put into it already, I'd like to resolve it.