Check if you have a Focus schedule set (Settings → Focus → tap a Focus → add a schedule). Also try restarting your iPhone after changing settings. Final verdict: Turn off Silence Unknown Callers and check your Focus modes. That solves 99% of “unknown calls not ringing” issues.
Here’s a solid, clear, and helpful post you can use on a blog, social media, or forum like Reddit or Apple Support. How to Unblock Unknown Calls on iPhone (Stop Silencing Legit Callers) how to unblock unknown calls on iphone
If your iPhone has stopped ringing for calls from numbers not in your contacts, you likely have a specific setting enabled. Here’s how to fix it—no need to unblock individual numbers. Check if you have a Focus schedule set