Do mp3 files still take up space on my iPhone?
If I utilize iCloud Match for iTunes, and I put all 37 GB I have in iTunes in the cloud, do I have to have 37 GB available on my iPhone 4S to play those songs on my iPhone 4S?
iPhone 4S, iOS 5, New User
Yes.
Icloud will donwload the music from icloud to your iphone.