The idea of iTunes Match is to store all your music on the cloud.
You have the possibility with this service to store on your iPhone your most favorite songs.
Of course, if you want to listen to songs that are not on your iPhone, it will stream or download from iCloud.
It will use your cellular data.
Ok guys so just a quick question, I'm contemplating on signing up for the iTunes Match service, the only thing that's holding me back is the thought that downloading or "streaming" a song on my iPhone off my cloud onto my music library will use up my monthly cellular data that Verizon puts a cap on all of its customers.
iTunes Match does not stream to iOS devices. All songs played are downloaded. And... yes, if you are away from a wi fi network the mobile data network will be used.
To listen to music without using mobile data pre-download music while on a wi fi network, then the songs will be played without using the mobile data network.