Here is how to handle both scenarios.
If a specific person cannot get through to you, you might have accidentally blacklisted their number. Use the system directory to remove them from your personal block list: How To Unblock Unknown Calls on iPhone how to unblock unknown calls on iphone
A Focus mode like "Do Not Disturb" can block unknown calls even if Step 1 is off. Here is how to handle both scenarios
When this is off, every number that calls your phone will ring through, regardless of whether they are in your contacts. When this is off, every number that calls
How to Unblock Unknown Calls on iPhone (Stop Silencing Legit Callers)
Disables screening completely; every incoming call rings out loud. Users expecting client calls or delivery updates.
Here’s a solid, clear, and helpful post you can use on a blog, social media, or forum like Reddit or Apple Support.