does the iphone have to have an at &t sim card in it to unlock and activate it? or can it have a sim card of a different carrier in it? or can it be empty and unlocked and activated? i will use ziphone to unlock and activate it. thanks.
HI no you don't need to have AT&T sim in your iphone to unlock it from AT&T ..You can easily unlock your iphone using your own other network sim card in it ...IF you want to unlock your iphone then have a look at sites like Prounlocking.com here they will unlock your iphone using remote unlocking service for affordable cost ....