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How to Fix a Blocked PUK

by Eric Wilborn
George Doyle & Ciaran Griffin/Stockbyte/Getty Images

For the safety of wireless subscriber's data and monetary investment, many GSM phone manufacturers (such as AT&T and T-Mobile) provide an option to place a PIN lock on a SIM card. This PIN lock keeps strangers from accessing what's on the SIM card or making calls with the locked phone. If you enter an incorrect PIN code three times, a PUK (Pin Unlock Key) code will be requested. This number is provided by the service provider.

Step 1

Take the battery cover off of the blocked phone and remove the battery.

Step 2

Write down the phone's IMEI and SIM card number. The IMEI can be found on a sticker behind the phone's battery (which you've already taken out). The SIM card number is printed on one side of your SIM card.

Step 3

Put the phone back together and power it on.

Step 4

Call your wireless provider from another phone and ask to speak with someone about PUK unlocking.

Step 5

Provide the representative with information from the phone and SIM.

Put the given code into the PUK lock screen to unlock your phone and SIM.

Items you will need

  • Another phone

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