Hey there.
Thanks for question.
The cache size depends on ways how yoy use apps. Offline mode will take more space, as this will download all stuff you mark as Offline in selected music quality.
If you stream, the app will use most likely 1-3 GB of data.
If you anytime will be in a battlefield with a space problem on your phone, just remove Spotify and it should delete cache. Then go for new install of app.
Hope this helps!
Peter
Spotify Community Mentor and Troubleshooter
Spotify Last.FM Twitter LinkedIn Meet Peter Rock Star Jam 2014
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