More often than not people tend to lose their mobile phones. We have a tendency to immediately call back to find out that the SIM was removed. For those of us, Savvy Infocenter has developed an innovative mobile application called S-Antitheft. If this app is installed in your mobile, whenever the SIM is removed from your mobile you immediately receive a SMS to a pre-stored number from the newly inserted SIM.Surprisingly, the person who changes the SIM doesn't even know that such an app is installed. This is amazing. And S-Antitheft is a freeware and works on Symbian 3rd and 5th Edition phones. For more details, one can refer to their website. They also develop mobile applications in all popular mobile operating systems.