I used to scroll to avoid having thoughts. it happened accidentally too, when I picked up the phone to check email or put music on. here's what worked for me:
+ get separate devices for different services if you can (may take awhile). like a dumbphone just for calls/texts, mp3 player just for music, physical calendar instead of using the app.
+ delete scrollable apps from phone. you can check notifs after school.
+ if you can't delete them, at least turn notifs/wifi off while you're working.
+ if you catch yourself scrolling, close the app and turn off wifi.
+ if your cat catches you scrolling, stop and pay attention to the cat.
+ when you stop scrolling, ask yourself if the time was well-spent. (sometimes it IS enjoyable! but be honest.)
+ accept that the need to check notifications is recurring, like hunger, and will continue to happen. you will need more. and more will come. no need to rush.
+ send more direct messages to your friends. you might be craving notifs because you're craving conversation/attention. friends are more likely to give you that than strangers.
+ close your eyes, get comfortable, and scroll through your
thoughts instead. this is called meditation. it will lead you to powerful self-discoveries that make scrolling, and the exterior world itself, irrelevant.
+ if your thoughts are bad, IFS therapy.
+ remember how upset scrolling made you last time.
+ you do not have to do anything in place of scrolling. if you're scrolling to procrastinate, you can still sit there and procrastinate without scrolling.
I identified which part of me wants to check notifications, and now I only do so when he needs his fix. that way, we do it intentionally and appreciate it more. AND I'm not tempted to peek when he's not around--wouldn't want to spoil it for next time!
A schedule may or may not work--depends on what kind of person you are. Never worked for me. my cravings are irregular, so predicting them is always a losing battle. Be careful you're not beating yourself up over an impossible goal! You'll find what works for you if you listen closely.