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You can already do this with a Tile. Leave a Tile in your wife's car and every phone with the Tile app in her vicinity will report her location to you.

> ... every phone with the Tile app ...

So effectively none. I've never even heard of Tile before this. Leveraging the whole Apple ecosystem for this sounds a lot more promising and will probably kill any competitor that depends on installing an app, even if that supports multiple platforms.

And more importantly: opt-in.

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