how do i know the iphone is unlocked
How do I know if I successfully unlocked my phone throught AT&T
iPhone 4
- Once you receive confirmation that your iPhone unlock has been processed, back up your iPhone.
- Erase the contents of your iPhone.
- Complete the setup assistant and restore your backup.
From Here > http://support.apple.com/kb/HT5014
Towards the end of the Restore... You should also see a meesage in iTunes along the lines of...
Congratulations your iPhone is now unlocked...