I'm trying to activate an old 3gs but am unsure of what carrier it is on. I don't really want to go testing all the sim cards I can find to see if I luck out.
Does anyone know of a way to find out?
I was wondering if I could write an app for it and use the
Core Telephony Framework to find the carrier but am not sure if that only show the carrier that is being used by the sim not what it is locked to.