Help Voice & data working intermittently on AT&T S2

[muditonline]

NEED HELP with S2 on AT&T.
I bought an unlocked version of the phone from Korea. Brought it to the US and used the AT&T sim with a $10 data plan meant for non-smartphones. Phone ran fine for 2-3 months. Data was a bit slow but worked and so did voice. The korean characters were bothering me, so I used ODIN to flash english version of the firmware (I9100). Ever since I did that, the korean characters are gone but voice and data are not functioning properly. Voice and data both only work intermittently. I tried the AT&T APN settings provided above but didn't help. Called AT&T and they seem to the think that the data plan needs to be changed to a Smartphone plan. I am willing to do that, but that shouldn't matter for voice right ?

Can you please help. I don't want to go out and buy a new phone altogether.

 

[tambovskya]

Just load the default firmware or put a rom on it! By-the-way this is the forum that can help you better, Samsung Galaxy S2 (International) - Android Forums . The information for rooting and custom roms are here, http://androidforums.com/galaxy-s2-...ot-guide-updated-00-11-gmt-dec-29-2011-a.html . Hope I helped, and if you have any questions just pm me.

 

[muditonline]

Thanks for the response. Can you help in identifying which firmware to select. The link you gave doesn't have any listed for AT&T or USA.

 

[tambovskya]

You can download any rom you like from this list: andrdcndy: Samsung Galaxy S II (I9100) ROM List .

They will all work on ATT, and your Galaxy S2.

 

[muditonline]

Thanks a lot, I will download and try.

 

[muditonline]

I downloaded one of the ROMs but the site doesn't give me the instructions on how to flash the new ROM. It doesn't seem to work with the ODIN connection. Can you please help me point to the instructions page.

 

[tambovskya]

Okay, the first thing you need is your phone rooted, the instructions are here, AndroidNZ: [At Your Own Risk] How to Root your Samsung Galaxy S II .

Then you need to install the rom, instructions are here, How to Install ROM on Galaxy S2! - YouTube .

Hope that helps!