Violent robberies of smartphones are on the rise. People are being beaten and robbed for their smartphones. Major U.S. wireless companies can easily combat this. Here’s how it works: Every cell phone has its own unique ID, or fingerprint. Once the phone is reported stolen, it would be blacklisted in the U.S. Wireless companies from Verizon to AT&T, T-Mobile to Sprint, would all share information, banning service on that stolen phone on all carriers forever.