Is this a good reason NOT to carry a cellphone in your hip pocket?

Two thieves, in their early twenties, had been stealing electronic games from a Target store. A strange 911 call came into a Madison, Wisconsin police dispatcher. At first, she did not realize what she was listening to as the two bragged on their thefts and plans to sell the stolen games to a local game store. After an hours recording, the dispatcher notified police detectives of the call. Detectives were waiting for them at the game store and were arrested. Question: is this a good-enough reason not to carry your cellphone in your hip pocket? Do you have other examples of how carrying a cellphone in your hip pocket has gotten you into trouble?

Source: ABC News.