i recently got an iphone and used winpwn to unlock/jailbreak it and i have cincinnati bell(sim card). when i use the at&t sim card that came with it goes to the main screen and everything works. except phone and messaging of course. so when i put the cincinnati bell sim card in it goes to the emergency call screen, it calls any number but cant go to the main menu. it says it needs to be activated but idk how to do it, can someone help me activate it