I've streamed Spotify for about 10 hours in the last two days and have only used 450mb of data on that app.
Yeah just checked.
Had it running at work just shy of 5 hours today. And almost exactly 5 hours yesterday. All on data.
Actually just looked again
420mb - 64.72mb Foreground, 356mb Background (this is combined data for this week, have only used data on it today and yesterday)
It was active today for 4 hours and 48 minutes.
Just got the S6 over the weekend, spending all this week screwing around with the settings and seeing how much battery/data stuff is taking up. On it like a hawk.
