Currently use an iPhone 3 with AT&T prepaid sim for over a year now, with no problem. Bought an iPhone 3GS put the sim in. Searches and searches and no signal. Then it'll connect to AT&T for a couple of minutes then go back to searching again.It is unlocked. Should it be jail broken also? It's running on the latest update also. Any ideas before I resell it? I've also tried the network reset.
См. статью: IPhone 3GS connection problems!