SIM Unlock Procedure

- Put in the SIM you want to use on the 680
(NOTE*** It has to be a non Cingular SIM card if you are trying to unlock your Cingular 680. It won't work if you use a Cingular SIM card in the device to unlock the phone)
- Turn on "wireless mode" on the smartphone by holding down the RED POWER button.
- Clear the "SIM not allowed" dialog by clicking OK
- Go to the DialPad (PhoneApp)
- Enter the code: *#*#<unlock code># and then press the GREEN button to initiate <DIAL>

That should work.