Default [Q] Samsung Galaxy Note 2 SGH-i317 AT&T Question and help

Hello Everyone

I have a Samsung galaxy note 2 from AT&T

I bought it from fry's and it was suppose to be an unlocked phone
any way I rooted the phone and started trying different ROMS

the phone is an AT&T stamped phone and my carrier is T Mobile by a sim card

when you get to the carrier choice on the rom install do you choose AT&T as the carrier or T Mobile???

playing around I have gone both ways to see if it will work

my currant rom I like is the Jedi x20
but when I install Jedi master x2 I can get it installed after two or three try's but then after awhile I lose my data connection and can not get it back!!!!????

I really like the Jedi master x2 but since it is for the t mobile phone I take it it wont work on the at&t phone??