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How to unlock an AT&T iPhone?
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Unlock an AT&T iPhone
1. Dial *#06# to get your iPhone's IMEI number and write it down.
2. Go to https://www.att.com/deviceunlock/ and click Unlock your device.
3. Fill out the form as completely as possible and click Submit.
4. Check your email for a confirmation email from AT&T within 24 hours.
5. Click Confirm in the confirmation email within 24 hours of receiving the email.
6. Wait up to 48 business hours for the unlock to be processed.
7. Back up and reset your iPhone to its factory settings.