Turn on your phone. On booting, you will be prompted ‘SIM locked’ or to ‘Enter PUK.’. Follow the prompt and input the PUK code sent by your carrier. Press OK. Enter a new PIN code (usually four to eight digits) and press OK. Verify your new PIN code by typing it in again when you see the prompt. Press OK once again, and your SIM becomes DoT: In view of increasing incidents of unauthorized use of one's details by others for taking mobile SIM cards and misusing them for illegal or unlawful purposes, the department has come up with Method 5: Check Your SIM Card Settings. In some cases, you can find the SIM card lock pin within the settings of your device. Go to your device’s settings menu and look for the “Security” or “Lock Screen” options. Within these settings, you may find an option to manage or change your SIM card lock pin. Failure To Pay Bills. The second reason operators may have a phone blocked from network use is when a subscriber fails to pay their contract bill. Network providers can blacklist a phone subject to an expired contract if the subscriber has failed to pay the due bill. If you are the original buyer, you most likely saw this reason coming. It's likely your SIM card requires a Pin Unlock Key (PUK) Code to continue use. To unblock your SIM card you'll want to follow these instructions to obtain and enter a PUK Code. We hope this info helps! Lar, AT&T Community Specialist. 0. mzE5.

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