That makes utterly no sense.
All you need to do is locate the suspect, beam a beam near him, power up his phone, use the Stingray software, and BOOM now you know where the suspect is!
See what I mean?
You had me ... lol. I submit.
Doubt it. You might be able to inject some energy into the phone's circuitry, but not in a manner that would cause its operating system to boot up and squawk. If you were close enough to do that, it's much more likely you'd simply destroy the phone, like an EMP or such.
There is a gadget known as the nonlinear junction detector. It is capable of detecting the presence of electronic devices nearby. It works by flooding the area with RF. It listens on harmonics of its transmit frequency. If there are nonlinear junctions nearby (semiconductor devices), they will receive the detector's energy and re-radiate some of it at multiples of the original frequency, thus betraying their presence.
Nonlinear junction detection is the basis of those bug sweepers you see used in movies. You basically explore the premises with the sweeper and investigate any nonlinear junctions found. The range is short, however. You have to be on top of a bug to find it.
When the US built a new embassy building in Moscow back in the seventies or eighties, the Soviets got to the concrete supplier and added thousands of little semiconductor diodes to the concrete mix. The result being that bug sweepers were useless in the new building, bugs being found everywhere!
For the case where you don't know who the guy is, only that he's the user of Phone X, then establishing that Person A was at the physical location of Phone X, and that no other persons were there, can be valuable circumstantial evidence.