Check Focus/Do Not Disturb (DND) is turned off:
This setting is located at: Home > Quick settings (Swipe down from the top-right corner) > Focus > Do Not Distrub off.
Check Silence Unknown Callers is turned off:
This setting is located at: Home > Settings > Apps settings > Phone settings > Screen Unknown Callers.
Check Cellular Signal and Airplane Mode is turned off:
This setting is located at: Home > Settings > Airplane Mode off.
Check Call Blocking:
This setting is located at: Home > Settings > Apps settings > Phone settings > Blocked Contacts.
Check Call Forwarding is turned off:
This setting is located at: Home > Settings > Apps settings > Phone settings > Call forwarding.
You've completed the steps!
