Is there any way to move songs from Spotify into your music app?

A friend of mine told me to try Spotify instead of buying iTunes cards since I have an iPhone 6. But what I'm wondering is can I move the songs I have on my Spotify into my music app just like it would if I would ve bought the songs on iTunes?

I don't think you can

No

Ok

No you can't do that. If you have Spotify premium you can download the songs on a playlist so you don't use data, but those songs are still on the app