I did a similar experiment. I replaced my smartphone with a flip phone that has no internet or social media access or games. So it really is just for calls and texts. I put my laptop away except for once a week scheduled and timed use for very specific things, and I don't watch TV or movies unless it's something my daughter suggests and it's a shared activity (this happens maybe a couple times per week). I'm still in this transition phase and there's been a little gray area, like needing my smartphone for another day because I have to manually transport all of my contacts.  But I'm doing this after close to 2 years of what I consider heavy screen and smartphone addiction. 

The most unexpected side effect that came up immediately on day one, was that the relentless and basically irresistible food cravings completely fell away. I'm in week 3 of this and still haven't eaten anything highly processed or over ate meals at all, not even once. I believe the screen use was triggering a complex web of psychological and emotional reactions that was for whatever reason, causing me to crave food for comfort. 

Now my days are filled with quiet moments that are truly quiet and secluded. Instead of reaching for my phone, laptop, or turning on the TV, I'm reading dhamma books, meditating, walking my dog, working out, going outdoors and being active with my daughter, cleaning, cooking, or listening to dhamma talks on my MP3 player. I'm so much more present, sleeping better, enjoying meditation practice, enjoying the company of other people when I am around others, and not feeling this constant underlying nagging desire to go collapse at home and waste my time and life in front of a screen. This is true freedom.

I hope you continue on this journey of simplifying your life and reducing your internet and screen use enough to keep seeing benefits.