Google Distance Matrix API free limitations

Question

I'm writing a mobile app and considering using Distance Matrix API to get the driving distance from A -> B. Google writes the following under Usage Limits:

Users of the free API:
    100 elements per query.
    100 elements per 10 seconds.
    2,500 elements per 24 hour period.

Are these 2,500 elements per phone or do all phones with my app share the same 2500 element limit?

Solution

For distance matrix alternative, I recommend MapQuest Route Matrix http://www.mapquestapi.com/directions/#matrix