[Q] Newbie: Do I need a ROM specific to my carrier? - Galaxy S III Q&A, Help & Troubleshooting

I apologize if this is a stupid question, but I couldn't figure out the answer clearly after doing a search. I currently have the S3 with sprint and am using the CyanogenMod 10 rom. I want to switch to T-mobile (b/c their service is better in my area) and I know that I will have to get a new S3 that works on their HSPA (or whatever its called) network. My question is will the same ROMs that worked on my Sprint S3 work on my Tmobile S3, or are roms carrier specific? Thanks

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[Q] How to Change the modem of T959 to I9000?

I have seen many Thread about I9000 trying to convert T959 modem to use the T-mobile network. What i couldn't find is from T959 to I9000 to make it to the international version.
I have the T-Mobile Vibrant T-959 unlocked with ECLAIR. I know that the network band of this phone is 850/900/1800/1900. i found the result according to Samsung website. I know in another post it was said that it is hardware issue but the hardware is 850/900/1800/1900.
I live in the United Arab Emirates and the network band here is 900/1800 similar to the European or Asian Network. but the T-mobile uses 850/1900 so i couldn't get 3G or any kind of internet connection here, unless i find a WiFi connection. I need the 3G connection on the move.
I want to know is there any way to change the the modem band to I9000? so that i can use a custom rom like Darky which is Stable according to many users.
I would never be using the phone on US T-mobile or any Network in the US.
You might think this Question is redundant and has already been answered but i search every where but it comes back empty.
Your feedback would be highly Appreciated!!!!
I don't think you can actually change your phone's bands.
However, an unlocked US T-Mobile Vibrant should be working on 3G. According to Wikipedia, the two 3G networks in UAE (du and Etisalat?) use the 2100MHz band, which should be supported.
Thanks for the reply, i tried everything but nothing worked.
One more question to ask, what will happen if i flash i9000 rom and radio on a T-mobile phone. Or should i just flash it with a T-mobile rom without changing the radio, and if the sim gets locked I will just unlock?
this is the final question to ask.
Don't know if this helps but I use my unlocked vibrant in the uk, so if European bands are the same...it should work.
You can change roms and I would recommend you should but you can't use an i9000 modem.
Do you have a Sim with a data plan?
Can you text or make calls?
pvspencer22 said:
You can change roms and I would recommend you should but you can't use an i9000 modem.
Do you have a Sim with a data plan?
Can you text or make calls?
Click to expand...
Click to collapse
Yes i can make a calls and send Text but no internet connection. I just bought data plan for my sim.
So i Should get Vibrant custom rom not the I9000 rom?
And thank you Guys for your replay, I hope this tread will help other confused users on XDA
I would like everyone to know that it is not good thing to change there modem from T959 to i9000 your phone will brick never do it.
I just flashed a new rom from Trigger 3.2 which upgraded to Froyo 2.2 and i put in the settings for the Access Point and it works perfectly.
So if you have any difficulty accessing 3g or HSDPA connection on android 2.1 just upgrade it and it will work.
How did you conclude you're not on 3G? Do you get EDGE or GPRS internet connection?
So i need the 1800 mhz how can i do?
Flash a i9000 modem and see if it works.
Sent from my GT-I9000 using XDA Premium App
There is the possibility to brick the phone?

Please help Galaxy I9100 for Web & MMS on Metro PCS

Hey guys any help would be appreciated. I'm about to get Galaxy S2 I9100 switched over to metro can somone or anyone please assist with conffig of the Data setting and MMS.... Please!!!!
klee2000 said:
Hey guys any help would be appreciated. I'm about to get Galaxy S2 I9100 switched over to metro can somone or anyone please assist with conffig of the Data setting and MMS.... Please!!!!
Click to expand...
Click to collapse
MetroPCS? Will this phone (specifically the GT-I9100) even work on their network? I thought they were a CDMA carrier?
EDIT: hold up. You say "about to get Galaxy S2 I9100 switched over to metro"... does this mean you already have the phone and are switching to Metro? Or did you order the phone and are waiting for it to arrive, and plan to switch to Metro?
Your profile says you are on T-Mobile USA. If you ALREADY have a Galaxy SII on T-Mobile, you probably have the SGH-T989.
If you DON'T already have a Galaxy SII, and you've ordered the GT-I9100, and want full use of 3g/"4g", you will HAVE to go to AT&T or H2O, or any other GSM carrier that may be regional to your area that uses the same frequencies as AT&T. Or, you could stick with T-Mobile, but your mobile data speeds will be limited to Edge.
MetroPCS uses completely different cellular transmission technology, and the GT-I9100 will not even pick up a signal on their network for voice, let alone data.
EDIT 2: For that matter, if you have the T-Mobile variant (SGH-T989), that one won't work on Metro either, for the same reason.
Well it's both I'm picking up the phone after work and I plan to get it flashed to Metro. I was told that the phone is the Sprint Samsung Galaxy S2 I9100. I'm doing it for my girl who already has Metro. I have seen other user selling Galaxy S2 already on Metro so I know for a fact that they have the Web & MMS working, I just cant find it for myself! Thanks for the reply by the way!
klee2000 said:
Well it's both I'm picking up the phone after work and I plan to get it flashed to Metro. I was told that the phone is the Sprint Samsung Galaxy S2 I9100. I'm doing it for my girl who already has Metro. I have seen other user selling Galaxy S2 already on Metro so I know for a fact that they have the Web & MMS working, I just cant find it for myself! Thanks for the reply by the way!
Click to expand...
Click to collapse
Who ever told you "Sprint Samsung Galaxy S2 I9100" is wrong. There is no such thing.
The I9100 is the international model that operates on GSM.
If it's from Sprint, they meant the "SPH-D710", not "I9100".
You are better off asking in this forum. Someone there may have experience flashing a Sprint variant to Metro.
It's not very likely that anyone here in the I9100 forums is going to be able to help you, sorry.
I think he posted the wrong model>>>>> What Carrier has Galaxy S2 model I9100???? I think sprint model is Sphd710!
Thanks for the Help!!!!
klee2000 said:
I think he posted the wrong model>>>>> What Carrier has Galaxy S2 model I9100???? I think sprint model is Sphd710!
Click to expand...
Click to collapse
If he said it's flashable to Metro, then yes, he got the model wrong.
NO carrier in the US carries the I9100. It is the international model. But like I said, it works on AT&T for voice and 3g/"4g" (which is what I'm using), and T-mobile USA for voice and Edge.

[Q] Korean version Galaxy S2 in the Us for T-mobile.

Dear XDA friends, I'm currently in the state, and using Galaxy S for Tmobile.
However, my mom coming to the state, and she says she will bring her Galaxy S2 for me cuz she recently changed to Note. So this would be an upgrade chance for me, and I love the design of international and Asian versions better than US version.
My question is, is it going to be possible to root, and flash one of the S2 roms that are in this site??? I'm aware i won't be able to use 3G speed, but if im lucky i would get new 1900mhz 3G though in SF. The phone is already country unlocked, but the reason why I'm trying to flash new rom is one of Korean wireless company developed their own messaging system on their S2 phones so because of that i won't be able to send text and mms.
If the interantional version and Korean version is the same, then sorry for my ignorance, but if they are different, can someone please give me help?
Thanks.

[Q]Can at&t gs2 run 3g/4g on tmobile?

Hi guys
I want to ask is it possible to change the at&t modem to a t-mobile modem so i can use 3g/4g on tmobile network if not just tell me im curious.
I saw this happen to the galaxy note and was wondering if it possible to do it on this phone.
thanks
Nope. It lacks the bands required for T-Mo frequencies.

[Q] AT&T roms or Tmobile roms?

I have a AT&T branded M8 that I use on Tmobile because it is sim unlocked. My question is, do I flash custom roms from the Tmobile xda board or do I stick with AT&T roms only? I've never use a nonbranded phone! Thank you.
Its a tricky question, actually. In general any ROM meant for the GSM M8 should be "safe" to flash, in that they won't damage your phone and will work for the most part (but stay away from the CDMA ROMs for Verizon and Sprint). But some ROMs might work better on your specific (T-Mobile) network. Also, a different radio may or may not affect reception. The most you can really do is to read up or ask other T-Mobile users (or even T-Mobile customers using the AT&T version M8 like you) what has resulted from trial and error; or experiment yourself.

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