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You would need to also consistently fake location data inferred from cell towers, which I guess is a bit more difficult to spoof.

I am dubious - not that I can't learn to alter my (android) phone so it thought it was in London when really it is in NY - but that I would not be tripped up by correlations. It would have to be a slow sensible variation, it would have to be within the correct cell - London / NY would not work - plus other dumb stuff that I simply don't know about radio propagation or being seen on a CCTV camera etc.

Nothing about spying is ever going to be simple. Especially building those vital human relationships.

The motion sensor has to keep moving. Apps don’t need permission for the motion sensor, they can freely send it over, it’s not private data.

In android they have to ask for it first ?

Pokémon GO had that problem. Lots of "flyers" hacked their GPS for fun and profit.