If you have used Spotify on the tablet, you noticed you that can navigate freely by the library allowing you to choose a song in particular or put in queue other songs. That Yes, if we are free users we will continue to have advertising and we do not have music offline. But in our smartphone thing changes, can only choose a playlist and play it to us in random order as if it were a radio. Also do you want to be able to choose songs loose on your phone?
It is as if we had Spotify Premium!