Palm Treo and Centro Unlock Instructions

Phone Unlock Instructions for Treo 650, 680, Centro:

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 we gave you).
5) Phone will reset and display 'sim lock removed'


Ensure you enter the codes in this manner *#*#CODE# (e.g. *#*#12345678#)

Troubleshooting
Error Message: "The SIM Lock has NOT been removed from this phone"
Solution 1: Please make sure you are entering the correct code and enter it using this method *#*#CODE# dial
Solution 2: If the phone says that the SIM lock has not been removed, ensure that the phone radio (wireless mode) is on.

If still having the error message "The SIM Lock has NOT been removed from this phone," the phone is likely refurbished and cannot unlock by code. Refurbished phones from the manufacturer are reflashed and take on a new IMEI. Because of this, the only way to unlock the phones is by software unlocking the phone.

Phone Unlock Instructions for Treo 750:

1) Power on with incorrect sim, enter unlock code when prompted
2) Enter code using ON-SCREEN (NOT physical keys) keyboard when unlocking a Pocket PC Phones

If above doesn't work

Wait for the next timout to complete. Then HOLD the white key button on the far left of the keyboard and then enter the unlock code with the PHYSICAL keys, not On-Screen.