mGuard is the world’s first theft recovery solution for Sony Ericsson Java mobile devices. mGuard can send notifications of a SIM change to a predefined number. However mGuard requires sending one text message per reboot of your phone to check for a SIM change. This will cost you on a regular basis. Roblock is a proven theft recovery solution for all the major mobile platforms such as Windows Mobile and BlackBerry. The Sony Ericsson version of Roblock can recover your contacts, locate your device using latitude and longitude and can send SIM change notifications without any running costs. Though mGuard is initially free, it eventually costs the user much more than the small one time registration payment made for Roblock. We recommend everyone to enjoy the benefits of upgrading from mGuard and being a Roblock user.