AT&T Palm Centro Unlock Instructions 1. Remove Treo battery, unplug cable 2. Insert incorrect a not allowed SIM card (one the phone does not accept) 3. Power on your Treo, “Sim not allowed” is displayed, click “ok” 4. Go to the dial pad, and use the stylus to enter code *#*#CODE#. Then press “Dial”. (substitute the word "code" with the unlock code which you can get at at&t palm centro unlock code). 5. Phone will reset and display “sim lock removed” Ensure you enter the codes in this manner *#*#CODE# (e.g. *#*#12345678#) Get AT&T Palm Centro Unlock Code
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