That's nonsense, of course. They'll continue to catch the dumb ones the way they always have: when the criminal screws up and a cop whose shift is still young just happens to be around. They'll continue to catch the smart criminals only very rarely, when someone with enough clout gets pissed off enough. They'll continue to "catch" innocents all day every day, only now they'll have more circumstantial "evidence" of the "this guy googled TVs last month; he was obviously trying to decide which TVs to steal" variety. This is why the Founders wrote the Fourth Amendment.
The phrase "horrifying crimes" makes me think of something violent. Evidence in violent crimes tends to be physical rather than mobile-phone-based.
Of course, you've also already admitted [0] that none of this is about catching criminals.