Today I unlocked my AT&T iPhone 4 running iOS 7 (the official method via AT&T). In order to use my phone abroad next month I'm told I'll need to be able to set APN settings but I can't find them anywhere on my device.
I believe the unlock was successful as iTunes showed a confirmation message saying so.
I've tried looking in various places suggested by posts on various message boards but I can't find the settings anywhere.
Best Answer
Assuming you still have the AT&T -SIM card (To verify, go into Settings > General > About > Carrier), AT&T will not allow you to change the APN settings, even on unlocked phone.
You need a SIM card from a carrier that allows APN settings change, that will depend on where are you going. Usually if you go to the new carrier they have a section explaining how to.
Some more helpful information.