Lose a phone? YouGetItBack will help get it back.

"Designed to help customers retrieve their missing portable devices, the new e-tag service will reside on a user's cell phone as an application, according to the company, and prevent anyone but the phone's owner from making calls if it is misplaced or stolen.

What's more, the service also provides a denial of service, remote delete, data backup and recovery, and guaranteed replacement functions for customers who use e-tagging. The company will store any critical information a customer has on his or her phone, and if it isn't returned, transfer that data to a new phone."