[Razengan]

"Why bother deterring the more-common low-effort risks if there are higher effort ways to thwart the deterrence?"

How often do muggers carry foil pockets even in first world countries? Certainly not in places where there's a mugging almost every week. Some way to track the device on its way to wherever they strip them off for parts would be helpful than not being to track it at all.

[saagarjha]

They don’t because they don’t have to. Make it necessary and they’ll switch within the week.

[Razengan]

That’s still only the preplanned muggings. Not the opportunists who spot an unattended phone somewhere by chance.