So an iPhone I bought the other day was working fine on all networks. It was jailbroken, but not unlocked via ultrasn0w or any other kind of software as when you checked the status of the phone on the Apple site, it states that the phone is unlocked to all UK networks. However, I wanted to restore the phone today to factory settings. I've updated it to iOs 4.2.1 but it only works on Orange! The phone was originally from Orange as an orange leaflet came with the phone but its since been unlocked officially so why doesn't any oter network work? Thanks!