Is the downloaded music treated as offline?

[WidimGFX]

I'm curious if I download an artist's album on my phone but not switch on "Offline Mode" in Settings, does Spotify stop using a cellular network while listening this album and start using a cellular network when needed for other songs? Or is it always streaming music till I switch "Offline Mode" on?

I hope it switching between playing/streaming automatically because that's the reason to download the music on the phone storage and save a battery life. If not - manual switching would be very irritating.

Regards,
David