To use an AT&T phone on another wireless network, you must unlock its SIM using an Unlock Code.
AT&T will provide the Unlock Code for phones on wireless plans if:
Your wireless service has been active for 90 days or longer
Your account is current and in good standing
Your phone is not sold exclusively by us
Your phone's Unlock Code is available from the Manufacturer
Please call Customer Care at 1-800-331-0500 to determine if your device can be unlocked, and for assistance unlocking your handset.