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How to Unlock AT&T / Cingular SIM Card

I get an Error Message "Enter PUK Code" on my Cingular phone

Unlocking your SIM card when asked for a PUK code.

When the above error message pops up, here's how you fix it:

  1. Log onto your Wireless Account on AT & T website.
  2. Click on Go in PHONE/DEVICE section.

  3. Click on Unblock SIM Card.

  4. Follow the instructions as shown.


Very Important:  If you enter an incorrect code for more than 10 times, it will permanently lock the SIM card and will become unusable.  You will need to replace it with a new one.  To buy a new SIM, please visit a store near you.


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