how to block unknown calls on iphone

To block unknown calls on an iPhone, the most effective method is to use the "Silence Unknown Callers" feature. This feature automatically silences calls from numbers that are not saved in your contacts, recent calls, or Siri suggestions. These calls are sent straight to voicemail and appear in your recent calls list without ringing your phone. Here is how to enable it:

1. Open the Settings app on your iPhone.
2. Scroll down and tap on Phone.
3. Scroll down to find "Silence Unknown Callers."
4. Toggle it on.

This setting prevents your phone from ringing or vibrating when receiving calls from unknown numbers but still lets you see these calls in voicemail and your recent calls list for screening. It's a handy way to reduce interruptions from spam or unwanted calls while not completely blocking unknown callers manually.

Additionally, if you want to block a specific number after receiving a call from it, you can:

1. Open the Phone app.
2. Go to Recents.
3. Find the number you want to block and tap the info (i) icon next to it.
4. Scroll down and tap "Block this Caller."

This blocks that particular number from calling you again.

If needing more advanced spam protection, some carriers or third-party apps offer additional call identification and spam blocking features that can be enabled in the Phone settings under Call Blocking & Identification.