Webon the iphone, go to settings > phone > silence unknown callers and turn on the silence unknown callers switch.
Anyone not in your contacts, list of outgoing.
Use mute switch or action button.
On iphone 15, 15 plus, and other older models, flip the mute switch downwards to switch to silent mode.
Webhaving your ringer volume off will silence incoming calls.
You can increase ringer volume by opening the settings app, selecting the sounds and haptics category,.
Webto ignore specific callers, you can set up a silent ringtone.
If someone’s blowing up your phone, you can selectively mute them.