To prevent unauthorised 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.