[icebraining]

You can't leak your location if there is no GPS module in your phone

While not as precise, you can definitively leak your location by scanning for the surrounding cell towers, especially in a city, which usually have hundreds or thousands of them (Manhattan alone has eleven, for example). I used to run a Python script on my Nokia phone that logged the tower ID, and I could reliable tell when I got to work, home, etc.

And that's just for people who control your phone. Your operator has U-TDOA¹, which is typically accurate to 50m.

The camera part is true, but tape is cheap :)

¹ https://en.wikipedia.org/wiki/U-TDOA

[jacquesm]

Sure, but that's telcos and the local law enforcement. It's not google, facebook, 500 advertising networks and a whole pile of other parties.

It's also not accurate to within enough resolution start targeting advertising and other nuisance information at me even if there was a way to present me that (which there isn't).

I'm well aware of the power of triangulation, I used to go fox hunting.

http://www.homingin.com/

[icebraining]

In some places, "just telcos" doesn't mean much: http://www.latimes.com/business/la-fi-lazarus-20140425-colum...

Though European laws are still mostly sane in that regard.

[beojan]

> especially in a city, which usually have hundreds or thousands of them (Manhattan alone has eleven, for example)

That's really quite a way from "hundreds or thousands".

[icebraining]

Sorry, I didn't explain myself well. I'm just talking about the main towers, for each of those there are many smaller ones. Check out http://opencellid.org/ it's amazing, actually.