Is there a safe way to find out if a used iPhone is intended to work on a particular carrier or is factory unlocked VS. having been unlocked by a third party?
I'm on the Rogers network. I'd want a phone intended to work on the Rogers network, or intended to work on any network, rather than one that might become relocked by a future update. (Also, I had a third party unlocked phone once before, and it liked to spontaneously restart. I don't think that was a coincidence.)
Jailbreaks don't concern me, since I can always revert those. But having a hacked baseband is something I'd want to know about.