>> sazius:

“I noticed that I often used to pull out my phone at the slightest hint of boredom. Now I'm forced to let my mind wander instead, or e.g. observe life around me. Not that bad actually.”

I have noticed this too (In the procedd of divorcing my smart phone). It lessens quickly..

As to your third point. I live quite rural so no mass transit.. For me it was noticing people picking up and checking their devices in the middle of a conversation just because there was the tiniest lul in it.. Which since I have nothing to check on my phone (which seems to now be the expected result) I'm left looking around and wondering what just happened. Quite an odd feeling.. like the other person just suddenly tuned out for 90 seconds.