Develop Bugs

Can i get Tmobile 3G/4G working on Unlocked ATT

I got a ATT S3 a Gift but i am on tmobile network, i was wondering if i can unlock it and use it Tmobile Nework along with Tmobile 4G, Is it possible if i flash the tmobile radios from Galaxy Note forum ?

vikramdhani said:
I got a ATT S3 a Gift but i am on tmobile network, i was wondering if i can unlock it and use it Tmobile Nework along with Tmobile 4G, Is it possible if i flash the tmobile radios from Galaxy Note forum ?
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No. Only edge network will work. 3g and 4g work on completely different spectrum and radio frequency
Sent from my SCH-I535 using xda app-developers app

If that was true the galaxy note from att wouldn't get T-Mobile 4 g which it does when flashing a blaze 4g modem I also want to know if this will work on the att s3
Sent from my Nexus 7 using Tapatalk 2

Yes it does I have it working on my father in laws note
Sent from my SCH-I535 using xda app-developers app

That may be true about the Note 2, but an ATT S3 does not have the T-Mobile 3/4G frequencies.

GTWalling said:
That may be true about the Note 2, but an ATT S3 does not have the T-Mobile 3/4G frequencies.
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Yes this guys right. Take a look for yourself:
ATT Galaxy Note Specs
T-Mobile Galaxy S3 Specs
ATT Galaxy S3 Specs
Notice how the Note and the T-Mobile Galaxy S3 have that 1700 Mhz frequency? Thats what T-Mobile broadcasts their 3G/4G spectrum on. If the phone doesnt have those frequencies, then it wont work no matter what you do.

horr1blek1tten said:
If that was true the galaxy note from att wouldn't get T-Mobile 4 g which it does when flashing a blaze 4g modem I also want to know if this will work on the att s3
Sent from my Nexus 7 using Tapatalk 2
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That's different. It is a whole different phone with a whole different SoC.
Let's not say things that we cannot prove.

Don't shoot this guy completely down. It will get T-Mobile 3g/4g as soon as T-Mobile refarms their network.
Sent from my SGH-T999 using Tapatalk 2

Some of my friends are getting 4g on their unlock at&t s3 with tmobile
Sent from my SGH-T999 using xda premium

JUSMEJOSE said:
Some of my friends are getting 4g on their unlock at&t s3 with tmobile
Sent from my SGH-T999 using xda premium
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Yeah, because they live in one of the small parts of the US that uses the 1900mhz band for HSPA. It will not work everywhere else.
Sent from my SGH-T999

What about the other way? A T-Mo SGS3 on AT&T? What does that get you? I know NO LTE but what about HSPA+ ?

MisterEdF said:
What about the other way? A T-Mo SGS3 on AT&T? What does that get you? I know NO LTE but what about HSPA+ ?
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Yes, HSPA+ will be fine. But as you said, no LTE.

4G data on an ATT GS3

Hi
So long story short, my Tmo GS3 got stolen at my work :/
So my mom gave me her ATT GS3 cus she was up for an upgrade,
i been reading its possible to get 4G on an ATT GS3 but so far no luck,
i know i have the right APN cus i copied the one from my Nex4 to my GS3, i set the network to manual and choose Tmo, but still all i get is Edge.
Does it have to do something with the way i unlocked the phone?
I been reading it has to be factory unlock and i unlocked mine by dialing *#197328640# and doing the required steps.
Can anyone help me with this?

Maybe you should try posting in the ATT S3 forums? I'm pretty sure that most people here have the TMO variant, while you are looking for tweaking of the ATT variant.
Sent from my SGH-T999 using Tapatalk 2

klin1344 said:
Maybe you should try posting in the ATT S3 forums? I'm pretty sure that most people here have the TMO variant, while you are looking for tweaking of the ATT variant.
Sent from my SGH-T999 using Tapatalk 2
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hahahah good idea XD
thanks bro

Also if you havent already tryed flash the tmobile modem and ur att gs3 is unlocked?
Sent from my SGH-T999 using xda app-developers app

deron37129 said:
Also if you havent already tryed flash the tmobile modem and ur att gs3 is unlocked?
Sent from my SGH-T999 using xda app-developers app
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Nop my galaxy is not rooted. And yes it is unlocked but with the method i said not with unlock code.
Sent from my Nexus 4 using xda app-developers app

Don't flash a T-Mobile modem, it will brick. T-Mobile and AT&T use different frequencies for hspa+ in most places, and the AT&T version doesn't have the hardware to pick up the most used T-Mobile frequency I believe. So you're probably stuck with edge
Sent from my SGH-T999 using Tapatalk 2

I'm stuck on edge too buddy....
orphan22 said:
Hi
So long story short, my Tmo GS3 got stolen at my work :/
So my mom gave me her ATT GS3 cus she was up for an upgrade,
i been reading its possible to get 4G on an ATT GS3 but so far no luck,
i know i have the right APN cus i copied the one from my Nex4 to my GS3, i set the network to manual and choose Tmo, but still all i get is Edge.
Does it have to do something with the way i unlocked the phone?
I been reading it has to be factory unlock and i unlocked mine by dialing *#197328640# and doing the required steps.
Can anyone help me with this?
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Click to collapse
You ARE stuck on edge.... I know it sucks. unless you are in a refarming area http://www.airportal.de/ , (major cities) your AT&T S3 1900/2100Mhz high speed data (4G) band will not work on T-Mobile's 1700/2100Mhz networks. I would sell it on e-bay or craigslist and got your T-mobile S3 again. or get the T-Mobile S4 after you sell your att S3 :cyclops:

[Q] help !! please att data not working on t-mobile 999

ok is there a rom that work right out the box for some sort of data with my prepaid at&t sim card i can make calls get mms, but cant get data i really need some sort of data working today i am rooted, unlocked and have no idea if i should be useing some sort of at&t kernal, or just changeing the apn, which has not worked yet?
can some one please direct me to the right thread or something

So you have a Tmobile T999 with an ATT prepaid sim?
I don't remember for sure so hopefully someone else can confirm, but I don't think the T999 can get better than 3g on ATTs network.
But if you're using the ATT sim, you'll be on their network so you may need to either unlock the phone and/or put in the correct ATT apn.
Sent from my SGH-T999L using xda premium

It will use HSPA on At&t no problem. Sounds like an APN issue. Your best bet is to go to the At&t forum and flash an At&t rom. Just make sure not to flash an At&t radio. Data should work out of the box on an At&t build.
Sent from my SGH-T999 using Tapatalk 4 Beta

I think it will use HSPA+ but only difference is that att hspa+ is not 42mg like on tmobile. I was getting around 7mg with my friends att sim on my t999.
Sent from my Galaxy Nexus using Tapatalk 4 Beta

gypsy214 said:
I think it will use HSPA+ but only difference is that att hspa+ is not 42mg like on tmobile. I was getting around 7mg with my friends att sim on my t999.
Sent from my Galaxy Nexus using Tapatalk 4 Beta
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This is correct. at&t uses the older HSDPA 7/14 and HSPA 21 depending on where you are located. They opted to go to LTE instead of a dual carrier configuration for their HSPA+

What service do you have with the prepaid att service? Did you have to get a new sim card? I looked everywhere on here, but didn't see anything

[Q] Data issues with SGH-m919 using att

I unlocked my T-Mobile galaxy s4 and have been using it on AT&T for the post free months, since then I'm experiencing horrible data issues, can any one help?
Sent from my SGH-M919 using xda app-developers app

What is the horrible data issues that you're taking about? Please be more specific. More info would help is help you
☞Sent from here☜

ds337135 said:
I unlocked my T-Mobile galaxy s4 and have been using it on AT&T for the post free months, since then I'm experiencing horrible data issues, can any one help?
Sent from my SGH-M919 using xda app-developers app
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Do you know if the tmobile m919 can receive 4g lte data on the att? thinking about unlocking mines as well just to have options
Sent from my SGH-M919 using Tapatalk 4

jjluv86 said:
Do you know if the tmobile m919 can receive 4g lte data on the att? thinking about unlocking mines as well just to have options
Sent from my SGH-M919 using Tapatalk 4
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If i could piggy back off this thread, I also have a tmo s4 on att network. Yesterday I was with a friend who was also on att and I noticed his phone at that time had 4g where the network bars were located, mine however read H+. It was then I realized that I have never seen the 4g symbol on my phone ever. Do I just not get 4g? Or does this ROM that I have on my phone (slim bean) either not have the files for 4g or maybe its originally a T-Mobile ROM so I'm not getting 4g I don't know. I do get LTE tho.

projectpaki said:
If i could piggy back off this thread, I also have a tmo s4 on att network. Yesterday I was with a friend who was also on att and I noticed his phone at that time had 4g where the network bars were located, mine however read H+. It was then I realized that I have never seen the 4g symbol on my phone ever. Do I just not get 4g? Or does this ROM that I have on my phone (slim bean) either not have the files for 4g or maybe its originally a T-Mobile ROM so I'm not getting 4g I don't know. I do get LTE tho.
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E is 2g/edge H is 3g H+ is 4g when you see 4g/lte that is LTE if your using and aosp based or international ROM... Hope that makes sense to ya
Sent from my SGH-M919 using Tapatalk

pyro43284 said:
E is 2g/edge H is 3g H+ is 4g when you see 4g/lte that is LTE if your using and aosp based or international ROM... Hope that makes sense to ya
Sent from my SGH-M919 using Tapatalk
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Ok this makes sense, thanks.

I had the same issues. If your previous phone that you used on AT&T was only 3G (I had an iPhone 4), your SIM card is only configured to receive and transmit 3G data. You will need to go on to wireless.att.net and order a new 4G SIM card, or go to a store and have them program one for you. This is assuming that you have already signed up for one of the new data plans, if not, they will likely not issue a SIM card capable of 4G and will probably hound you via email and SMS about using a 4G device on an old 3G data plan.

T-Mobile Note 3 to AT&T

Hello, all.
I recently decided that I must move from T Mobile to ATT because of unresolvable signal issues with the Note 3 at work. The phone was paid for in full at T-Mobile, and I was told that all I needed to do to move to ATT was to follow an unlocking procedure, which I did at the ATT store. At the ATT store I also moved my Nexus 5 over to ATT without a hitch, but the Note 3 has no LTE or data for that matter. Voice and text work fine. This had the ATT employee stumped.
Is there a technical reason for this and if so, how do I fix it? Many thanks.

You need to add the APN for AT&T data. I'm running a T-Mobile version on AT&T as well.
Sent from my Note 3...making all others drool!

At&t is better than tmo? Better NAHHHH. Better speeds? Mayyyybe just maybe
Sent from my SM-N900T using xda app-developers app

djbrian52 said:
You need to add the APN for AT&T data. I'm running a T-Mobile version on AT&T as well.
Sent from my Note 3...making all others drool!
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I played around with the APN settings, eventually just copying what was on my Nexus 5 and PERFECT! Everything works now.
Much thanks!

chuko303 said:
At&t is better than tmo? Better NAHHHH. Better speeds? Mayyyybe just maybe
Sent from my SM-N900T using xda app-developers app
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I really didn't want to give up T-Mobile because I was getting amazing 40/10Mbps LTE. It doesn't matter to me what I get at home, since my home connection is 100/5. Now I'm on AT&T I am getting about 6/1 but at least I can use my phone at work without worrying about reliability.

I hate all carriers said:
I really didn't want to give up T-Mobile because I was getting amazing 40/10Mbps LTE. It doesn't matter to me what I get at home, since my home connection is 100/5. Now I'm on AT&T I am getting about 6/1 but at least I can use my phone at work without worrying about reliability.
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How different are your nexus settings compared to mine? Also, don't just say thanks but slap the thanks button too.
Sent from my Note 3...making all others drool!

djbrian52 said:
How different are your nexus settings compared to mine? Also, don't just say thanks but slap the thanks button too.
Sent from my Note 3...making all others drool!
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Yes, just slightly.
But on the Note 3 the URLs were some sort of Cingular address.

Questions and help issues go in Q&A and Help section
Thread moved
Thanks
FNSM

Can I get ATT version of Note3 on t-Mobile and get 4G since T-Mobile refarmed their towers?

SKORPiO1975 said:
Can I get ATT version of Note3 on t-Mobile and get 4G since T-Mobile refarmed their towers?
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Yes you can! The newer galaxy models like the note 3 and synchronized what bands they utilize for communication.