Re: i need help with Samsung i607 BlackJack unlock code
Format a phone won't re-lock the phone (I assume you mean SIM unlock). Once unlocked, it is forever unlocked. You're probably having problem with configurations because it will go back to AT&T configurations, especially for data connection. You need to re-configure the phone for whatever carrier you're using,
AT&T typically only give out unlcok code for its post paid customer only.