mGuard is a free SMS based anti-theft software for Java J2ME MIDP 2.0 mobile devices and specifically optimized for Sony Ericsson Walkman series, Z-Series and K-Series. mGuard does not rely on Bluetooth, GPRS or GPS for its functionality and can be used on any Java mobile phone that supports sending and recieving SMS text messages.

After installing the application, you need to configure three settings for configuring the application:

mGuard Anti-theft for Sony Ericsson

+ Password to change settings
+ Predefine mobile phone number where a text message should be sent when the SIM card is changed
+ Custom message that should be sent to the phone number in the previous step
+ Other features include complete stealth operations and low memory footprint

Download mGuard for Sony Ericsson after registration here