A quiet mode is useful when it follows a routine instead of depending on you remembering a switch. iPhone Focus can run on a schedule and allow selected people and apps. On Android, look for Modes or Do Not Disturb; available scheduling controls vary by phone and software version.

Build a modest rule for a meeting or an evening reading session, then test it. Review allowed calls and alarms so the phone still does what you need. We rank this above Wi-Fi sharing because it can change how you use the phone every day; someone who needs constant availability may prefer another feature.

Official guides: Apple · Google.

Illustration: Topnilo; phone icon by Assaf Katz, adapted. All artwork: CC0.