Hello, My iPhone 4Gs 64GB has been playing up for the last 2 or so weeks. When I go from wi-fi to 3G my internet or SMSs do not work; when someone tries to call me, the iPhone doesn't ring and comes up as a missed call. Because of this I decided to reinstall iOS 5.0.1. I forgot to do a backup so I had to restore from iCloud to retrieve my photos. Once restored, it asked for all the Apple IDs associated to the phone (I use three apple IDs to download my apps). Funny enough, a fourth email popped up - I don't own this email and I don't know the individual who owns the email (I facebooked them and they live in the same city as I do). No, none of my friends have installed apps on my phones, and I am the only one that touches my phone. Is it at all possible that my iPhone has somehow been hacked? I will be changing all my passwords etc.