Your SIM card locks again when you turn off Wireless Mode and then turn it back on. To permanently unlock your SIM card:
1.Press Menu 
.
2.From the Options menu, choose Phone Lock (/L).
3.Uncheck the Lock SIM option.
4.When prompted, enter the current PIN and choose OK.
System password lock
To protect your personal information, you can lock the system so that you need to enter your password to access any of your data or use other features of your Treo.
1.Press Applications Launcher 
.
2.Choose the pick list in the
3.Choose the Security icon.
4.Choose the Password box.
5.Assign a password and a password hint to your Treo.
6.Choose the Auto Lock Handheld box.
7.When prompted, enter your password.
8.Choose one of the following options:
•Never: Prevents your Treo from locking automatically.
•On power off: Locks your Treo when you turn off the screen, or when it shuts off with the
•At a preset time: Locks your Treo at a specific time of day.
•After a preset delay: Locks your Treo after a period of inactivity.
Important: If you lock your system, you must enter the exact password to unlock it. If you forget the password, you need to perform a hard reset to resume using your phone. Performing a hard reset deletes all the records in your phone. However, you can restore all previously synchronized data at the next HotSync operation (see page 137).
To lock your system manually, choose Lock & Turn Off, and then choose Off & Lock.
