I've never own an iphone before. The iphone 4 was bought from ebay and the seller said it was fully jailbroken and unlocked. I don't mind the jailbroken part but is it really unlocked? It's on the home screen with NO SIM sign. I can do anything just like using an ipod touch. The apps are all from apple and there's NO cydia. When I go to settings-general-about, it says the Carrier AT&T 7.0 Is it still being locked to ATT or is it already unlocked in some other ways?