What works best is small steps, I believe. First deal with your smartphone access. Delete all, but essential apps(e.g. your work) in your phone, you can still v

What works best is small steps, I believe. First deal with your smartphone access. Delete all, but essential apps(e.g. your work) in your phone, you can still visit whatever you want on another device you don't carry around with you everywhere, e.g. a laptop. Do that for a month or until you feel ok about it. Start to do SOMETHING ELSE that is somewhat productive, e.g. a sport and is not browsing the internet. Make sure over time to up prioritize that activity and down prioritize browsing. Rinse and repeat :-)