turn off/mute ALL notifications that aren't absolutely critical, crank up your notification/ringtone volume, keep your phone somewhere out of the way but within earshot like next to your front door or in the bathroom, and find other things to play with. Buy an instrument, video games, books, movies, whatever. When you get bored, you need something ready to play with or else you're going to just walk over to your phone
We get addicted to shallow things like phones when we don't have something better to keep our attention. Find something better that you have real fun with, not something that just kills time