Where's My Cell Phone is a handy new online application to help find misplaced mobile The service is actually low-tech: it simply redials whatever number you enter and you follow the ring until you've found your beloved handset, answer the call, and turn it off. The service is U.S. only for now.

In theory it could be used to annoy your friends to no end, although when you pick up you're given the option to take your number off the list permanently.

The creators also claim your number is never saved or kept tracked. This is a good thing and a bad thing, as taking your name off the list means you can never use it again, so be careful when you answer that found phone.