To prevent unauthorized use of your device, you can lock your device and memory card remotely using a text message. You must define the message text, and to lock your device, send that text message to your device. To unlock your device, you need the lock code.
To enable remote locking and to define the text message content to be used, select Menu > Settings and Phone > Phone mgmt. > Security settings > Phone and SIM card > Remote phone locking > Enabled. Tap the text input field to enter the text message content (5 to 20 characters), select , and verify the message. Enter the lock code.