Advertise an app that allows you to find your phone through GPS. Send a message/link "You found it near you this time, but what if you left it somewhere else? T

Advertise an app that allows you to find your phone through GPS. Send a message/link "You found it near you this time, but what if you left it somewhere else? Try this cheap app..." So in other words, a premium version for people who already found your free version useful.