Since April, I have been experiencing a huge spike in data usage due to the spotify premium app on my iphone. This never used to be an issue, and my listening habits have not changed. I stream on my phone for maybe 20-30 minutes a day. This should not be happening. My phone bill was an extra $90 last month because of this.
Solved! Go to Solution.
Reinstalled and resynced my downloaded playlists. Still uses cellurlar data to play previously downloaded songs. I brought this to the attention of @SpotifyCares on twitter and they made a tweak to my cache and asked me delete the app and reinstall. Did this again, but the problem persists. This needs to be fixed.