noob help: unlocked tmobile phone; no data on ATT - Galaxy S II Q&A, Help & Troubleshooting

hi - i have an unlocked galaxy s2 (tmobile branded) that i'm trying to make work on att. the phone works to receive and make calls/texts, but doesn't do anything data related unless i'm on a wifi signal (apps, mms, internet, etc). my questions are:
1. someone told me this can be resolved by updating the APN settings, but I cant figure out how to do that. Is that something ATT will help me with? Or is there a simple way for a novice user to do it?
2. is my data going to completely stink? I read on another thread that this might only give me access to EDGE/2G (though I'm not sure why). Is there any way for me to have a good data speed on an unlocked phone?
Thanks in advance - sorry for the silly questions!

Why two threads ? You opened a thread about the same thing all of 15 minutes ago. Easy enough to continue to use that thread for further questions/edit your OP & title if need be.

MistahBungle said:
Why two threads ? You opened a thread about the same thing all of 15 minutes ago. Easy enough to continue to use that thread for further questions/edit your OP & title if need be.
Click to expand...
Click to collapse
When I made the OP and hit submit, the captcha failed, I got an error message, and couldn't find the thread when I searched for it. So....because I didn't know the first one had actually posted.

TMobile phone with data should work on ATT.
Reason: 1. These are the 3G frequency bands for S2 .. 850 / 1700 / 1900 / 2100 (TMobile) and 850 / 1900 / 2100 (ATT). Hence ATT frequency band is safe.
2. These are the 2G frequency bands for S2 .. 850 / 900 / 1800 / 1900 (ATT & TMobile). No problem there.
Solution:
1. someone told me this can be resolved by updating the APN settings, but I cant figure out how to do that. Is that something ATT will help me with? Or is there a simple way for a novice user to do it?
Yes that could help. It is not that hard either. Try to change your apn settings according to the screenshots:
http://img.tapatalk.com/4a486a99-ba70-c7e0.jpg
http://img.tapatalk.com/4a486a99-ba79-67c0.jpg
if this fails to give you connectivity. Try this :
on your phone dialer: *#*#197328640#*#*
select [1] DEBUG SCREEN
select [8] PHONE CONTROL
select [7] NETWORK CONTROL
select [2] BAND SELECTION
select [2] WCDMA Band Preference
select [1] WCDM 850
press Menu Button
select END
2. is my data going to completely stink? I read on another thread that this might only give me access to EDGE/2G (though I'm not sure why). Is there any way for me to have a good data speed on an unlocked phone?
ATT networks are on a slower 14.4 Mbps network for 3G while TMobile is on 21 Mbps network. So, your data will be slower. How much slower it would depend on my factors like location, surroundings etc. But, as I said above ATT 3G frequency band is covered on the TMobile version T989. So, you should have access to 3G. If you have an ATT version I777 and if you want to try using it on TMobile then you can only access EDGE/2G as TMobile uses 1700 MHz for their 3G connections. (Which is not available on the ATT version I777).

thanks, satish.
i'm not sure i'm following your answer on question 2. how can i tell what ATT version i am on? or is it safe to assume that if i am on ATT 3G i am on tmobile t989?
if it helps, i'm in philadelphia area, pa, us

i'm not sure i'm following your answer on question 2. how can i tell what ATT version i am on? or is it safe to assume that if i am on ATT 3G i am on tmobile t989?
I777 and T989 are model numbers. You can find the model numbers on your device ... go to Settings > About Phone > Model Number.

satish1986 said:
i'm not sure i'm following your answer on question 2. how can i tell what ATT version i am on? or is it safe to assume that if i am on ATT 3G i am on tmobile t989?
I777 and T989 are model numbers. You can find the model numbers on your device ... go to Settings > About Phone > Model Number.
Click to expand...
Click to collapse
oh, of course! it is t989 - thanks very much.
looks like i will be trying this again tonight...

oh, of course! it is t989 - thanks very much
There is a different forum on XDA for T989. If you had posted there you would have got more replies. You are asking in the wrong forum. This is meant for I9100 (European Model/International Version).
This the correct forum for your question : http://forum.xda-developers.com/forumdisplay.php?f=1329

did any of those solutions work for you ? ... it would be nice to have some feedback ... it might helps others who have the same problem ...

satish1986 said:
did any of those solutions work for you ? ... it would be nice to have some feedback ... it might helps others who have the same problem ...
Click to expand...
Click to collapse
He doesnt have a i9100 model!
Sent from my Galaxy S2 GT i9100

Related

[Q] Only getting Edge Network

Hey Everyone,
I just picked up an unlocked/unbranded GTI-9100 and am only picking up the Edge network for T-Mobile USA. Is there a certain Modem or Kernel I need? The 9100 is on 2.3.3, so I guess I should root it and flash upgraded ROM/Kernel package? I am fimilar with ODIN as I have a Vibrant and a T-Mobile GS2.
Thanks in advance for your help.
I think you should double check your network settings and APNs
Sent from my GT-I9100 using XDA App
ionious said:
I think you should double check your network settings and APNs
Sent from my GT-I9100 using XDA App
Click to expand...
Click to collapse
My APN is the same as on my other T-Mobile phones?? HELP Please
Guess im just gonna ODIN the speedmod Kernel for root and Clockwork. Can an american get some help with his international phone?? Dang!!
You might get some help if you wait until someone with an answer reads your post .Thats assuming from the tile they pick up is a Yankee with an international version ..
If modem and kernel you have now dont work i cannot see why others would .
jje
vabeach454 said:
Hey Everyone,
I just picked up an unlocked/unbranded GTI-9100 and am only picking up the Edge network for T-Mobile USA. Is there a certain Modem or Kernel I need? The 9100 is on 2.3.3, so I guess I should root it and flash upgraded ROM/Kernel package? I am fimilar with ODIN as I have a Vibrant and a T-Mobile GS2.
Thanks in advance for your help.
Click to expand...
Click to collapse
With the GT-I9100, you'll ONLY ever get Edge on T-Mobile USA. Doesn't matter what you flash. The phone simply doesn't have the hardware to receive 1700mhz UMTS, which is one of two necessary bands (the other being 2100mhz UMTS) for 3g/4g on T-Mobile USA's network.
The GT-I9100 will only ever get HSPA/HSPA+ on AT&T's network in the US. I'm sure of this - I have an I9100, and am on AT&T.
Sorry to be the bearer of bad news.
ctomgee said:
With the GT-I9100, you'll ONLY ever get Edge on T-Mobile USA. Doesn't matter what you flash. The phone simply doesn't have the hardware to receive 1700mhz UMTS, which is one of two necessary bands (the other being 2100mhz UMTS) for 3g/4g on T-Mobile USA's network.
The GT-I9100 will only ever get HSPA/HSPA+ on AT&T's network in the US. I'm sure of this - I have an I9100, and am on AT&T.
Sorry to be the bearer of bad news.
Click to expand...
Click to collapse
Thanks ^^^ That kinda sucks, but sounds like nothing I can do.
vabeach454 said:
Thanks ^^^ That kinda sucks, but sounds like nothing I can do.
Click to expand...
Click to collapse
Nope. Not short of getting an AT&T account just for that phone, anyway.
...
(sorry, here comes some snark)
Unless you're comfortable cracking open the phone, ripping out the antenna, replacing it with one that will receive 1700/2100 mhz UMTS, decompiling the OS, tweaking it to recognize the new frequencies, and recompiling.
ctomgee said:
Nope. Not short of getting an AT&T account just for that phone, anyway.
...
(sorry, here comes some snark)
Unless you're comfortable cracking open the phone, ripping out the antenna, replacing it with one that will receive 1700/2100 mhz UMTS, decompiling the OS, tweaking it to recognize the new frequencies, and recompiling.
Click to expand...
Click to collapse
Thanks... Looks like I can sell it for GOOD money to AT&T people for a good profit. I traded my wifes MyTouch 4G for it , so I am still in the good.
maybe flash KI3 modem... most stable one atm in my opinion!
omgitsniklas said:
maybe flash KI3 modem... most stable one atm in my opinion!
Click to expand...
Click to collapse
Extremely stupid answer please read post 6.
jje
omgitsniklas said:
maybe flash KI3 modem... most stable one atm in my opinion!
Click to expand...
Click to collapse
Really??? *facepalm*
vabeach454 said:
Hey Everyone,
I just picked up an unlocked/unbranded GTI-9100 and am only picking up the Edge network for T-Mobile USA. Is there a certain Modem or Kernel I need? The 9100 is on 2.3.3, so I guess I should root it and flash upgraded ROM/Kernel package? I am fimilar with ODIN as I have a Vibrant and a T-Mobile GS2.
Thanks in advance for your help.
Click to expand...
Click to collapse
Im also in the US on t-mobile got this phone, and had no idea id only get edge. Edge does suck but I love this phone, ill keep this phone for awhile
How do I get the exclamation point off at bootup? Another Kernel??
vabeach454 said:
How do I get the exclamation point off at bootup? Another Kernel??
Click to expand...
Click to collapse
You can either get a USB jig or flash a stock kernel back. Try a search. This has been asked a CRAPTON of times.
ctomgee said:
You can either get a USB jig or flash a stock kernel back. Try a search. This has been asked a CRAPTON of times.
Click to expand...
Click to collapse
OK... Thanks.
Ok I used my jig and cleared binary, but its still in DL mode. Can i restart the phone or do I have to use odin now?
EDIT: Nevermind I got it. lol
Remove battery .
jje
Just found this forum... have the exact same issue. I have the GT-I9100 Intl version from Australia and now in the USA for a couple of weeks using T Mobile.
The dude behind the counter asked if my phone was unlocked, which it is. I told him that it supports Quad Band UMTS 850, 900, 1800 and 2100mhz and he said I'd get full HSPA+ reception on the 2100mhz band...
Sure enough, it's only Edge. I THINK there might be a setting in the Device Config (on keypad * # * # 197328640 # * # *) and possibly change something to use the US 2100mhz or something like that...
I can live with using Edge, but just interesting whether it's just a config setting that needs to be changed in the handset itself to pickup a different connection type for US 2100mhz bands?
Whip Cracker said:
Just found this forum... have the exact same issue. I have the GT-I9100 Intl version from Australia and now in the USA for a couple of weeks using T Mobile.
The dude behind the counter asked if my phone was unlocked, which it is. I told him that it supports Quad Band UMTS 850, 900, 1800 and 2100mhz and he said I'd get full HSPA+ reception on the 2100mhz band...
Sure enough, it's only Edge. I THINK there might be a setting in the Device Config (on keypad * # * # 197328640 # * # *) and possibly change something to use the US 2100mhz or something like that...
I can live with using Edge, but just interesting whether it's just a config setting that needs to be changed in the handset itself to pickup a different connection type for US 2100mhz bands?
Click to expand...
Click to collapse
I9100 only gets Edge on T-mobile USA because it doesn't receive 1700 WCDMA. If you want 3g/"4g" you'll have to go to ATT or another carrier that uses the same frequencies...
T-mobile USA uses AWS for high speed mobile internet, which REQUIRES BOTH 1700 & 2100mhz WCDMA. One is used for uplink, the other for downlink. Only receiving one of them won't work, which is why you're only getting Edge.
Dude behind the counter is wrong and doesn't seem to know how AWS works.
EDIT: BTW, UMTS and WCDMA are somewhat interchangeable in this instance.

[Q] Modem firmwares. Any that would work.

I am curious..
I bought a SGS2 i9100 (international)
the site i bought it from says
Wireless RadioGSM 850 / 900 / 1800 / 1900 MHz
UMTS 850 / 900 / 1900 / 2100 MHz
Now.. i have a HTC panache (mt4g) that is on my carrier... and it says
AWS 1700, 2100 MHz (Bands I et IV)
IS THERE A MODEM I CAN FLASH FOR MY SGS2 that would work on my HTC panache carrier?
OK. Let's try this again...
Finding a modem that works well with your carrier & it's network with the SGS2 can be a bit of trial & error. Basically if the modem you're currently using is giving you lousy coverage/data speeds, start flashing/testing modems until you find one that works for you. Here's a link to a bunch of CWM flashable I9100 modems you can try to get you started. Do a Google search with XDA appended to your search terms & you should be able to dig up heaps of posts that link to others you can download/try.
Well it seems like i do have a australia modem (BUKI1)
When i put my SIM card from my HTC phone.. The SGS2 automaticly goes into roaming and doesn't detect the non roaming carrier..
By the way I'm in canada.
IT ALSO SEES THE APN for my HTC phone carrier when i put the sim card.. but goes straight to roaming
tradeware said:
Well it seems like i do have a australia modem (BUKI1)
When i put my SIM card from my HTC phone.. The SGS2 automaticly goes into roaming and doesn't detect the non roaming carrier..
By the way I'm in canada.
Click to expand...
Click to collapse
It can only detect a carrier on auto if the CSC has the carriers settings .
OZ modem most likely OZ CSC as well . Just set network manually .
jje
JJE i tried that... it doesn't even list the carrier in the list...
goes straight to roaming..
I think it's the modem that not doing it since it's a autralian Modem...
BUKI1
tradeware said:
IS THERE A MODEM I CAN FLASH FOR MY SGS2 that would work on my HTC panache carrier?
Click to expand...
Click to collapse
No, see http://forum.xda-developers.com/showthread.php?t=1203385
So it is impossible.. Can anyone else confirm this?
tradeware said:
So it is impossible.. Can anyone else confirm this?
Click to expand...
Click to collapse
Is your network T-Mobile USA? (I'm guessing yes since you've also got a MyTouch4G?)
The phone does not have the necessary radio hardware to receive 1700 mhz. Which is one of the bands necessary for AWS. So nothing better than Edge on T-Mobile USA.
No amount of modem flash is ever going to fix a hardware limitation.
Edit: Oh, I see from one of your posts above you're in Canada, so you're NOT on T-Mobile USA. BUT everything I said is still valid. If you're trying to get the phone to receive 1700 mhz, you won't have a lot of luck without some major phone surgery involving a hardware antenna engineer, as stated in the link provided to you by oinkylicious.

Bell I9100M would it work with? and why

first off i know the seniors are going to start *****ing at me for starting a tread when there is like 6 already. But this is different for many reasons:
1. bell galaxy s II i9100M does indeed support 1700 / 2100 UMTS as stated both in the booklet, and also on their webside. I own one and was wondering which modem file would allow those frequencies and how would i get it working with Mobilicity & Wind.
thanks in advance
http://www.bell.ca/Mobility/Products/Samsung_Galaxy_S_2_HD_LTE/Specifications.tab
Platform
Operating SystemAndroid 2.3 (upgradeable to Android 4.0)Apps storeGoogle Play
Connectivity
Network compatibility4G LTE and HSPA+Maximum download speedUp to 75 Mbps (4G LTE), up to 42 Mbps (HSPA+)HSPA/UMTS compatibility850/1700/1900/2100 MHzGPRS/EDGE compatibility850/900/1800/1900 MHzGlobal access Wi-Fi Mobile Wi-Fi hotspot DLNA GPS Bluetooth®Bluetooth® 3.0Other
Micro USB
HDMI via MHL (optional accessory)
directly form bells site
Wind & Mobilicity use AWS frequencies (1710–1755 up, 2110–2155 down) these are generally not supported by Bell Mobility branded handsets as Bell does not use these frequencies, the phone you linked is capable of the same frequencies as the GT-I9100M other than LTE and the GT-I9100M is not capable of H+ or 3G speeds on Wind or Mobilicity, in order to get 3g/H/H+ speeds on Wind or Mobilicity you would need an AWS capable phone (ie one from them or T-Mobile USA).
thank, now that's the answer i was looking for
mnaderi said:
http://www.bell.ca/Mobility/Products/Samsung_Galaxy_S_2_HD_LTE/Specifications.tab
Click to expand...
Click to collapse
You may or may not care, but this link is NOT to the i9100M.
ctomgee said:
You may or may not care, but this link is NOT to the i9100M.
Click to expand...
Click to collapse
That's true, but it doesn't matter for his particular question, the model he linked wont work on the network he wants to use it on either.
thracemerin said:
That's true, but it doesn't matter for his particular question, the model he linked wont work on the network he wants to use it on either.
Click to expand...
Click to collapse
Maybe it doesn't matter for that particular question, sure. I just was trying to let him know so he doesn't try to flash a firmware for the wrong model or something.
SGS2 GT-I9100M Bell Canada want to use with Wind Mobile Canada
ctomgee said:
Maybe it doesn't matter for that particular question, sure. I just was trying to let him know so he doesn't try to flash a firmware for the wrong model or something.
Click to expand...
Click to collapse
Hi, sorry to jump into this thread, but I would like to know f you went ahead with this phone into Wind service and if so, how did this work for you?
I started a thread and some body there told me maybe better to ask in these two threads... my problem is explained here:
http://forum.xda-developers.com/gala...1/post54374435
Thanks a lot for any contribution to my solution.

[SOLVED] Why is my network speed only Edge? GT I-9300 on AT&T (Straight Talk)

I live in the Chicago Suburbs, and I got my brand-spanking new International Galaxy S3 [GT I-9300] delivered by Expansys today ($778.97 plus taxes). Color is "marble white", and it's a thing of beauty; I just love the phone!
However, when I added the "Straight Talk" (AT&T) SIM card and completed the setup process as described, I wasn't even able to download Apps from the Play store... because my connection is too slow!
I verified twice that all my APN settings are correct, but all the speed I seem to get is "Edge" (phone is displaying a tiny 'E' in the status bar) with max speeds of 212 kbps UP, and 140 kbps DOWN... - WHAT A JOKE!!!
My question: what am I doing wrong?
I did my due diligence before buying the phone; making sure that AT&T delivers decent speeds on the frequencies that the I-9300 can pick up.
Just for comparison's sake, the GT I-9300 covers the 850/900/1800/1900 MHz bands for 2G GSM/GPRS/EDGE, and 850/900/1700/1900/2100 MHz for 3G UMTS/HSPA+.
According to AT&T's website, they primarily use the 850 and 1900 MHz bands here in the US - which means, I should be able to get HSPA/HSPA+ speeds around here.
No such thing, I'm afraid.
Any idea what the problem may be?? I have searched for answers in this Forum already, but came up empty...
Sounds like you could be in a 3G black area like where a few metres either way could give a 3G signal, so just try your network in another phone and you'll know.
Maybe you got the T-Mobile version of the sin card by mistake
Sent from my Galaxy Nexus using xda premium
Thanks for the input!
I'm pretty sure it's an AT&T card, as all the APN setup instructions that came with it are for Cingular/AT&T..
Looks like I have to give Straight Talk a call tomorrow; hoping that this can be figured out...
Sent from my GT-I9300 using xda premium
The APN setting were correct, but -apparently- I wasn't familiar enough with the "Mobile Network" setting... since there was no indication of it in Straight Talk's setup instructions and I never had to mess with it before on my previous phones...
Anyways...
Go to SETTINGS > MORE SETTINGS > MOBILE NETWORKS > NETWORK MODE:
Select select "GSM/WCDMA (Auto mode)"
In "Network Operators" (right below) press "Select Automatically"
I also made another change that I read about when searching for a solution. And even though it is believed that it does not solve the problem, it helps to "speed up" things... by whatever margin that may be:
In "ACCESS POINT NAMES" (part of "MOBILE NETWORK" menu):
Change the "PROXY" from proxy.mvno.tracfone.com to 66.209.11.33
As a matter of fact, 66.209.11.33 is the same address as proxy.mvno.tracfone.com, but the phone/service does not have to resolve it anymore - as it already is 'translated'. This is believed to make things a bit snappier and get you better/faster service.
No idea if it really does anything at all... but since my phone is working just fine - and finally at HSPA and HSPA+ speeds(!!!) - I am not going to change it back anymore....
I have to say, the $45/month all-unlimited Straight Talk & Data SIM (AT&T service) really works well on my GT I-9300! It is not giving me LTE speeds, but it's just 35% of the price I used to pay Verizon before (month-to-month service w/ 450 talk minutes + 5 [upped to 10GB as part of their promo] Data plan) for LTE, which was sucking my REZOUND's battery dry in no time flat. And HSPA+ is certainly fast enough for what I need my phone for...
What's not to like??!
As for me, I like it much better now!!!
Glad you got it fixed quick.
androidarmin said:
I did my due diligence before buying the phone; making sure that AT&T delivers decent speeds on the frequencies that the I-9300 can pick up.
Just for comparison's sake, the GT I-9300 covers the 850/900/1800/1900 MHz bands for 2G GSM/GPRS/EDGE, and 850/900/1700/1900/2100 MHz for 3G UMTS/HSPA+.
Click to expand...
Click to collapse
Just for clarification though, I see you mentioned the I9300 using 1700 and 2100Mhz. Where'd you get that info? Those are Tmobile HSPA+ bands. I'd love for the phone to support that, but don't think that's correct
farfromovin said:
Glad you got it fixed quick.
Just for clarification though, I see you mentioned the I9300 using 1700 and 2100Mhz. Where'd you get that info? Those are Tmobile HSPA+ bands. I'd love for the phone to support that, but don't think that's correct
Click to expand...
Click to collapse
Thanks, farfromovin!
You may have a point there, buddy... Those are supposedly the bands that the International Galaxy S3 can pick up in general, according to Wikipedia. Here in the US, however, you're out of luck if picking T-mobile as your carrier for the I-9300, because they broadcast 3G on a different band, which the S3/I-9300 does not pick up by default... so I had verified by a bunch of folks in the Forums.
I was looking into exactly the same thing before I made the decision to go with a prepaid "Straight Talk" (AT&T) SIM card. ST also offers an T-mo version, but with that - as I had stated before - you'll only get 2G in the US; at least for now (note: this may change by end of the year/early in 2013, so I've read, as Tmo is making adjustments/improvements to their network and 3G/4G frequencies..).
Hope this helps.
If you happen to live in the US and haven't heard yet, all major carriers here will come out with the S3 in just a few weeks. Carrier-branded only, and "just" with the 2-core Snapdragon S4 CPU inside (due to LTE).
But, this phone is so awesome, I wouldn't even mind having only 2 cores if I were not able to run the International/Unlocked version on HSPA+ here in the US... But, 4 cores kick some serious butt, dude!!
Cheers,
Armin
androidarmin said:
Thanks, farfromovin!
You may have a point there, buddy... Those are supposedly the bands that the International Galaxy S3 can pick up in general, according to Wikipedia. Here in the US, however, you're out of luck if picking T-mobile as your carrier for the I-9300, because they broadcast 3G on a different band, which the S3/I-9300 does not pick up by default... so I had verified by a bunch of folks in the Forums.
I was looking into exactly the same thing before I made the decision to go with a prepaid "Straight Talk" (AT&T) SIM card. ST also offers an T-mo version, but with that - as I had stated before - you'll only get 2G in the US; at least for now (note: this may change by end of the year/early in 2013, so I've read, as Tmo is making adjustments/improvements to their network and 3G/4G frequencies..).
Hope this helps.
If you happen to live in the US and haven't heard yet, all major carriers here will come out with the S3 in just a few weeks. Carrier-branded only, and "just" with the 2-core Snapdragon S4 CPU inside (due to LTE).
But, this phone is so awesome, I wouldn't even mind having only 2 cores if I were not able to run the International/Unlocked version on HSPA+ here in the US... But, 4 cores kick some serious butt, dude!!
Cheers,
Armin
Click to expand...
Click to collapse
That is wrong info..anyone can put info on wikipedia. It matters what's on the box and on the box it's the standard quad band for umts. There is no 1700 band on the box and so no hspa speed for tmobile.
Sent from my GT-I9300 using Tapatalk 2
Try leaving the Straight Talk Proxy setting blank. I think you will see much better data speeds.
I'm having the same problem, but your solution didn't work for me. I cant seem to shake edge connection. I had hspda last night
S_Dot said:
I'm having the same problem, but your solution didn't work for me. I cant seem to shake edge connection. I had hspda last night
Click to expand...
Click to collapse
Yeah same prob. GS2 GT-I9100T Only Edge network :/
SGS3 i9300
kirdroid said:
That is wrong info..anyone can put info on wikipedia. It matters what's on the box and on the box it's the standard quad band for umts. There is no 1700 band on the box and so no hspa speed for tmobile.
Sent from my GT-I9300 using Tapatalk 2
Click to expand...
Click to collapse
I agree kirdroid, you can't trust Wikipedia to be 100% truth. However, in this case the Wiki page is correct.
/wiki/Samsung_Galaxy_S_III
The page is for all models of the Galaxy SIII. There is a graphic on the right side with specs under it for ALL models. Then there is a table in the middle of the page that shows the specs for each model. If you look at the all models specs it looks like one hell of a phone. You have to look at the table with specs for each model to see that I9300 supports:
2G: 850, 900, 1800, 1900 MHz GSM / GPRS / EDGE
3G: 850, 900, 1900, 2100 MHz UMTS / HSPA+
T-Mobile H+ (2.75G) not working for me in Salt Lake City, UT. Customer support said 1900 MHz is supported for H+, but I'm guessing she didn't check for Utah. As of December 20, 2012 it is not available in Utah. You can search Google to see what markets it's available in: "t-mobile-closes-the-year-by-enhancing-coverage-in-14-new-metro-areas"
I'd post links, but I'm not allowed.

[Q] T-Mobile Samsung Galaxy S Vibrant on Telus?

I’m located in Ontario, Canada. Will the T-Mobile Samsung Galaxy S Model SGH-T959 (Wind, USA, GSM 850/900/1800/1900 MHz, UMTS 1700/1900/2100 MHz) phone work on the Telus network (no GSM, UMTS 850/1900 Mhz)? Please note that Telus carries a variant phone called Samsung Galaxy S Fascinate Model SGH-T959D (UMTS 850/1900/2100 MHz). I tried everything on the SGH-T959 including adjusting band selection, flashing to stock 2.1 ROM, flashing different radio modems, inputting Telus APN, unlocking the phone). Your help would be greatly appreciated.
This interests me as well. Anybody know?
I missed the line in your post saying that you already unlocked the phone. My mistake. You may verify that it is in fact unlocked, by testing another working SIM.
Try going to your dialer and typing *#*#4636#*#* and press call. It will take you to an advanced menu. Look around through the settings, and you should find a place that has settings such as GSM Only, GSM +CDMA and others. Tinker with them and make sure GSM only isn't set, because that may not allow your network to connect. Keep us updated.
------original post-------
Have you tried the apps in the Play Store that unlock the vibrant? Not sure what they are called but I bet a quick search of the P.S. and you'll find it.
Works like a charm I've heard.
Update: I just went and looked in the Play Store and Galaxy S Unlock by Helroz is the one in particular that I have heard good things about. The others probably work just fine, I just haven't seen anything posted about them.

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