Criminals are smart enough to remove the battery, or not carry a cell phone during a major crime. So this mostly just enables the government and telecom companies to track law-abiding citizens.
Really? All criminals? I'm not a big fan of developments in surveillance, but it's crazy to think that some criminals won't be caught. The fact that they're petty criminals or benefits cheats makes the exercise of debatable value, but not for the reason you state.
