Warning: Do not enter any wrong unlock unlock codes on your Palm One Treo 680 mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.1 - Switch ON your Palm One Treo 680
without SIM Card, It will then say "Your phone cannot be used with this SIM card".
2 - Click ok.
3 - Click dialpad tab, bottom of the screen far left.
4 - Using stylus type
*#*#CODE#.
5 - Press the green button.
6 - It will then say "The SIM Lock has been removed from the phone".
Each Palm One Treo 680 mobile phone has an unique unlock code. You can buy the unique unlock code for your Palm One Treo 680 mobile phone at www.mobileunlocksolutions.com.