How to unlock a SIM card password

Written by amy mcclain
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How to unlock a SIM card password
Each SIM has a unique unlocking key. (sim card image by Renato Francia from

SIM cards hold important subscriber information, and your GSM phone won't operate without one. Most phones allow you to set a security PIN to protect your card from unauthorised use--a handy feature until you're unable to remember the code you used. You can try the default password, but continued wrong entries will result in a blocked SIM card. In this case, the password you'll need to unlock the SIM is called a PUK, or PIN unlock key.

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Things you need

  • Device with blocked SIM card
  • Wireless carrier's customer service phone number
  • Wireless account details (phone number and account password)
  • Pen and paper

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  1. 1

    Enter in the default PIN code if your device is requesting a PIN. For most phones, this is "1111." Press "OK." If the device does not accept the code, continue to enter it incorrectly until you are prompted to enter a PUK code.

  2. 2

    Contact your provider's customer service department by calling the toll-free hot line. If you don't know the number, it should be listed on your invoice.

  3. 3

    Request the PUK code for your device. You will need to verify your account details--phone number, account security password and account holder's name--before the representative will release the code. Write down the code.

  4. 4

    Use your phone's keypad to type in the eight digit PUK code. Press "OK."

  5. 5

    Enter in a new PIN code of your choice. Press "OK." Re-enter the PIN when prompted to confirm it, then press the "OK" button. Your SIM is now unlocked.

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