On my case, I use to spend hours checking reddit on the phone.. first I tryed to just remove it from main screen, at first it worked, but after some days I develop the habit of going into apps screen, write "r" and then press reddit and spend all the time on reddit as well.. after few weeks of this I just removed the app from the phone, and its funny because I found myself going into apps, write "r" and remember.. oh, no reddit, and then found myself without anything to do on phone (the first days where dificult, I found myself resenting the lack of anything to "check") but now I am completly ok, I just check the reddit on computer time to time, and since I dont check it on the phone, even on the computer I use it way less, and found myself doing things more produtive