Method 1: Using the PUK Code. If you have entered your PIN code incorrectly multiple times, your SIM card may get locked. In such cases, you can use the Personal Unblocking Key (PUK) code provided by your service provider. The PUK code can be obtained by contacting your mobile network’s customer service helpline.
To complete the unlock on your device, Verify that your device is eligible to be unlocked, make sure your device is on Wi-Fi, insert a non-T-Mobile SIM card into your iPhone and complete the first
Step 1. Contact your cell-phone carrier to obtain the PUK Code. The PUK Code is retained by the carrier who supplied the SIM card. You may find it easier to call the carrier--often for free on the phone--or register your details and SIM card at the carrier's website and obtain the PUK code that way. Video of the Day. sVsg.