Lookout Labs analyzed data from 15 million users who employed an app that locates lost cell phones, and determined that Philadelphia led the nation in lost or stolen cell phones in 2011.  Lookout Labs says people in Philadelphia and Seattle lose their cell phones twice a year.

The top ten cities for cell phone loss during 2011:

1. Philadelphia
2. Seattle
3. Oakland, CA
4. Long Beach, CA
5. Newark, NJ
6. Detroit
7. Cleveland
8. Baltimore
9. New York
10. Boston