Prey is an open-source anti-theft tool that lets you track your mobile phone or laptop. It’s free to use but there is paid account too for large companies. It works on Android, Windows, Ubuntu, Mac OS and Linux. Every version uses a Web control panel and a client which you’ll have to install on your mobile device – anyway, it’s really easy to do so and does not require much configuration.
You might be a little bit in fog right now so let me explain what this application does actually… Well, Prey reads every incoming SMS, and if any contains the activation code (“GO PREY” by default), your phone goes into “missing mode”. At that moment it will try to contact the servers.
In the web interface you can set Prey to send you a SMS in case the thief changes the SIM card or you can make your phone display a message or ring a police-siren alarm and there are a lot more options which I’ll let you find out yourself.