What is no caller id on iphone?

A "No Caller ID" message on an iPhone typically means the caller has blocked their caller ID information from being displayed on your phone. This can be done for privacy reasons or to prevent the recipient from knowing who is calling.

If you receive a call with a "No Caller ID" message, you will not be able to see the caller's phone number or name on the screen. However, you can still choose to answer the call or send it to voicemail.

It is worth noting that some scam and spam calls may also come through as "No Caller ID," so it is always advisable to be cautious when answering such calls. Additionally, it is possible to block or filter calls from unknown or "No Caller ID" numbers on your iPhone to reduce the chances of receiving unwanted calls.