Small but significant change to interacting with a phone:
I discovered today that it's possible to prevent the phone app icons (e.g. the icon for Whatsapp) from showing a little red badge with the number of unread messages in the top-right corner.
Android interface, translated from Spanish:
Settings / Notifications / App Icon Badges on the Home Screen
-> "Don't show"
The small "number of unread messages" badge is an _alert_, and psychologically registers as a potential problem of unknown magnitude, interrupting whatever your train of thought was before you saw it.
Alerts should be reserved for something that really is critical, not a new message in a whatsapp chat group.
It's important in this era to limit (as much as feasible) the ability of an interface to capture your attention, and thus the number of interruptions / day.
Interruptions increase stress and break concentration.
The strategy today is to preserve your ability to concentrate.