for i-phones with iOS13 or later, do the following:
Go to "Settings"
Click on "Apps".
Scroll down to"Calls"
Tap "Silence unknown calls"
Tap "Turn On'.
These steps may be slightly different depending on the software edition you have, but you need to get to "Silence Unknown Calls". IMPORTANT: Make sure that you have your "Contacts" list up to date, as your phone will only ring if it recognizes the phone numbers of your friends, relatives, doctors, dentists etc. you have saved.
Calls from unknown numbers (spam e.g.) will not be heard and they will be routed to voicemail. You will see a list of these calls under "Recents" so you can block them or just erase them. (Something you can do in your spare time instead of fretting about the missed calls from buxom young wenches 😳).
Hope this helps.![]()
Done