Maybe I'm an ass for pointing this out, but it's trilateration, not triangulation. I set out to learn the mathematical concept, and not knowing the right term had me waste an entire evening looking at something more closely related to tessellation, than spatial position locating.

You don't sound like an ass at all. Hell, if I had wasted the better part of an evening due to a simple nomenclature mix-up, I'd post it as well when the right concept comes up. It might save others some time.

Funny thing is I'm really familiar with the tech - I did COIN in the bush war in Angola, where we did a lot of triangulation (old school, using an oscilloscope). I've given up trying to explain the difference.

Because GSM, GPS and WiFi combined are, bar GPS, more accurate and pervasive together than any one in isolation. Also because when location services are off, photos don't get tagged with my location coordinates, and apps can't use my location either.

Location services are configurable per-app in iOS 6, so you can have Maps allowed to use them and Camera forbidden.

(Settings -> Privacy -> Location).

Android can do that too, I believe. I have a Windows Phone. Settings aren't that granular.

A Windows Phone App which uses the Location Service is required to have a setting to enable/disable the use of this service[1].

It's probably not as comfortable as the solutions of iOS/Android, but it gets the job done.

http://msdn.microsoft.com/en-us/library/windowsphone/develop... - 2.7.3