Unlocked iPhone - how to determine

[gsusser]

I probably couldn't have picked a worse day to ask this, but here goes...

AT&T supposedly unlocked my phone a few days ago. I did a backup and restore, didn't pay attention much and now can't figure out if the phone is unlocked or not. Aside from trying to put another sim in the phone, is there a way to tell if it's unlocked?

 

[Paratel]

there is nothing on the phone that will alert you that the phone is unlocked. The only way to tell is do another restore. and the end of the restore, a white screen will come up and say that the phone has been successfully unlocked.

 

[Applejuiced]

Get a tmobile sim to test out.
But if AT&T confirmed that they unlocked it I wouldn't worry much.