Put your phone out of reach! Leave it in another room or even just far enough that you would have to get up to grab it. It makes putting down your book for your phone something you have to intentionally do instead of an autopilot thing.

Also, make sure you’re reading books that really excite you; once you’re into the habit I think it’s easier to push through challenging or slow but rewarding books, but while you’re establishing it, I’d choose books that are fast-paced and engaging.