Hi there NA_24,
If you are receiving calls from unknown numbers, we would recommend utilizing the Silence Unknown Callers feature on your device. This information from Detect and block spam phone calls has more on the benefits of this and how it can resolve what's happening:
Turn on Silence Unknown Callers
With iOS 13 and later, you can turn on Silence Unknown Callers to avoid getting calls from people you don’t know. This blocks phone numbers that you've never been in contact with and don’t have saved in your contacts list. If you’ve previously texted with someone using their phone number or if a person has shared their phone number with you in an email, a phone call from that number will go through.
To turn on Silence Unknown Callers, go to Settings > Phone, then scroll down, tap Silence Unknown Callers, and turn on the feature. Calls from unknown numbers are silenced and sent to your voicemail, and appear in your recent calls list.
Incoming calls will come through from people that are saved in your contacts list, recent calls list, and from Siri Suggestions to let you know who’s calling based on phone numbers included in your emails or text messages.
If an emergency call is placed, Silence Unknown Callers will be temporarily disabled for the next 24 hours to allow for your iPhone to be reached.
Before you turn on Silence Unknown Callers, make sure you have important contacts saved or you could miss a phone call that you don’t want to miss. The call will still go to voicemail and appear in your recent calls list, but you won’t get a notification while the call is ringing.
If you would like to further detect and block these calls from unknown numbers, follow the 'Set up an app to filter and detect spam calls' section of that article next to set this up.
We hope that helps!
