• No push notifications (except for one human, and that too via SMS).
• No "social media" accounts (never had it on the phone to begin with; and removed my FB account 5+ years ago).
• Use gray scale (this turned my phone into a very peaceful device). On Android, this can only be enabled via the "Developer options" (and then select "Simulate color space" --> "Monochromacy")
• The "apps" on my phone are most practical ones: Maps, English & Dutch dictionaries, Orgzly (Org-Mode-based note taker), Spotify, Signal, WhatsApp, a couple of train look-up services, Firefox and an OTP generator.
This has been instrumental in making sure that my attention is not splintered all over the place. And lets me retain the ability to concentrate and read books in 2-hour, undistracted blocks. Go me!