
Sprint offers SIM card unlock services both online and via its 88 number. Visit your local AT&T store to get the SIM card unlocked as an alternative to using the online process. If your device is not currently displaying “Enter PUK,” press “* 05” and then type in the PUK code. Click “Get Your PIN Unlock Key (PUK).” Launch the "Phone" app on your device, type this PUK number into your locked SIM card Android or iPhone device and then tap “OK/Yes” to unlock the SIM card.



Log into your AT&T wireless account and navigate to “My Wireless” followed by “My Devices & Features” and then click on the SIM card locked device. The process to unlock an AT&T SIM card is similar to Verizon’s.
