Originally Posted By: Russ
Does the phone have a GPS chip? If it does then it uses neither data nor voice plan. Hmmm something else to check. I'll put the phone in airplane mode and see if the phone still knows where it is.
Edit: never mind, airplane mode turns that off too.


Just ran a quick experiment on my Galaxy s3 (android version 4.1.2); with airplane mode on, GPS still works and generates a position. I went back online, downloaded a local map from Google Maps, went into airplane mode again and GPS found my location on the downloaded map. But it looks like downloading lots of map data will really eat up your storage quickly.
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