Bad habits are the chains of ether: endless and powerful. Be it smartphone addiction or any other bad habit, some time down the line it starts running us.
Here is the life changing trivia: good habits are more powerful than bad ones.
Stop focusing on removing bad habits and start focusing on replacing bad ones with more empowering choices. For example, read a page of a small book for those 2 second bursts when you feel like checking your notifications. Or go for a walk before hitting send on that angry email and you will probably not send it after that walk. Also, just get up and make some movement in your body instead of sitting sadly on your couch.
Replace your habit instead of removing and see the magic.