My phone just went over its data plan even though I've been watching it pretty carefully. Tonight, it went from 90% to 100% and beyond my data plan usage. I couldn't figure out why. But then I see that Spotify has suddenly been taking up a ton of background data. I only use it when I'm in the car, which is about 45 minutes per day, and I don't listen every day.
http: // imgur.com/XbCBuCt
http: // imgur.com/XbCBuCt