In an effort to not repeat some of the great comments already, I think it would be beneficial for you try to find things to do that don't involve your phone.
Try to find something to do that you find more interesting than being on your phone, sports (Running/Cycling), hobbies, walks etc.
I'm as guilty as anyone for looking at my phone too often, its usually only when I have nothing better to do, because of that it makes it worse.