How do I know which apps are running and do they count against my data?

[Ms_Bryan]

My data usage went up double this month.  When I am using runtastic does that use my data package each time?

[#2]

Which phone do you have? Should be as simple as going to Settings then tapping Mobile Data

[#3 · Accepted solution]

Anything you use not on WiFi will use up data. Music, Movies, games just to name a few.

The only exception is if the game is loaded fully on the device and does not require any data interaction.

Good Luck