It's always good to have a book on the go – and don't waste time on a book your not enjoying! I keep a list of things I enjoy doing (sewing, gardening etc) so if I find myself missing my phone I've got an easy reference of other things I could be doing!
While I am studying, I keep my phone away. For when I'm reading a novel, I try not to look at my phone or laptop. I also avoid phone while having my meals.