Palm One
Treo 650, 680
- Power on phone with a non-original SIM card inserted
- Turn wireless off
- It will then say "Your phone cannot be used with this SIM card" ("SIM not allowed" in case of Treo 650). Click OK
- Click dialpad tab, bottom of the screen far left
- Using stylus enter *#*#unlock code# and press the green button
- It will say "The sim lock has been removed from your phone"
- Your phone is unlocked
Treo 750
- Power on phone with a non-original SIM card inserted
- Turn wireless off
- Using onscreen keyboard enter the supplied unlock code
- Your phone is unlocked