I have a non AT&T iPhone (bought outside of the USA) which I unlocked with ultrasn0w / blacksn0w. I can use it for voice in AT&T (GoPhone) and it works fine. But it seems I can't use it for anything related to data (email, browsing, etc).
Is there a special configuration needed to be able to use data (as pay-on-the-go) on the AT&T network?
Thanks in advance!