Is it possible to determine if my phone is unlocked without buying another SIM card?
I don't know where it was originally purchased or what the original terms of the phone service were.
All my relatives are on the same network, so it doesn't help to borrow their SIM.
Best Answer
Three methods work for deteriming if an iPhone is unlocked:
Apple maintains a nice article explaining which carriers offer an unlock as well as other iPhone related services. If you didn't buy the phone yourself, it could have been sold originally as an unlocked phone in which case you would need to know this fact or experiment with two SIM to know if that device is in fact one that is authorized as an unlocked device.