So my brother's girlfriend came to me with her friend's old iPhone. She wanted to use it so I went through Redsn0w and unlocked it without Cydia/Icy; it would more than likely confuse her. Initially, the unlock went fine until she later plugged in the phone into the computer to add music, etc.. She can still make calls and texts, but often she get's 5/6 texts that are post-marked an hour or so back. I've tried resolving it by taking it back through Redsn0w several times, but the problem still pops up. Now I know that for a T-Mobile user you are advised to disable 3G on the iPhone, but she is an AT&T customer. Any help would be greatly appreciated as I have run out of possible options, as far as my knowledge reaches.