Can’t view my playlist outside my WiFi range

So please bare with my incompetence. I am not very savvy in regards to working my way through computer related stuff. I have a nucleus plus. I can’t access my Roon app on iPhone when I leave my house. I sometimes wish I could view my playlist or library when I’m out. For example if I want to play the jukebox when I’m out a reference to my Roon would refresh my mind on some good songs that I don’t have seared in my memory. Also could I listen to my Roon through my iPhone when I’m away from home. Any help would be much appreciated!!

Roon only works in your home network, it has no mobile options