I try to take a day off each week from the computer/internet. I prefer life when I get more then one day a week offline - but I find it increasingly difficult to meet my community obligations if I take more time off from the computer. A number of years ago I became very involved with an "online community" - to the determent of my physical and mental health. Because I've experienced a tendency to withdraw from the "real world" - I feel that perhaps I am more vulnerable then most towards undesirable overuse of screen time, specifically online, and now try to keep myself quite aware of how much and for what purpose I use online tools. I don't want to live online, I want to be happy in my life, and for me, too much online is a threat to happiness.
This is not to say that there aren't good reasons to spend time online, just that too much of anything is a danger, and perhaps "too much" for one person is just
enough for another, and too little for a third person. Each person has to figure out their personal Goldilocks zone, and I suspect it changes with life circumstances for each individual, as well.
I do not use a smartphone on a regular basis, only when traveling. The phone lives in a drawer in the basement most of the time, and most of the time it's off. I am amazed by how few people seem to be creeped out by the modern smartphones ability to track it's own location - and thus yours too! I hope never to develop the "smart" phone habit. I'm grateful that I experienced childhood before smartphones became ubiquitous.
I do get "antsy" sometimes when I'm on an offline day - "bored" - because it's so easy to entertain yourself passively, and it requires a little
energy to come up with something else to do now that I'm habituated to turning on the computer and vegging out for fun. I find it easier to be offline in the spring/summer - in the fall/winter I now have a tendency to occupy time by stuffing my face when I can't think of anything else to do instead of turning on the computer. Now that the weather is nicer, I can make myself take a walk with less effort, and soon there will be more outside
yard work too. Keeping "busy" - even if it's only busy with finishing reading a novel or playing with the dog - is an important way for me to avoid screen time.
As for TV, I watch two to two and a half hours of TV a night, mostly because it's a family habit. While on holidays away from home I find I miss TV very little. I just read or write instead, and often cook/eat supper later and go to bed earlier, which I don't think is a bad thing.
Another major technological down fall of mine is radio. I listen to the radio a lot. I tell myself it's "better" then screen time, since I can wander around "doing stuff" while I'm listening to it, and I'm not sitting staring at a bright light on a flat screen, but but I'm still drowning out any meditative thoughts or ideas I might otherwise have.