The Lookup button has an icon of a person and a magnifying glass that would be available to search when the number is an unknown caller, available on the Google Phone app's recent list.

If you find yourself inundated with unknown or “No Caller ID” calls, the good news is that, depending on your smartphone model and operating system, it’s pretty easy to filter them out.

Seeing “Unknown Caller” appear when your phone rings can be a bit unsettling. Most of us are never quite sure whether to take a chance and answer these calls or send them off to our voicemail.

No Caller ID vs. Unknown Caller A call labeled " No Caller ID " means the caller has blocked their number from appearing on your screen. In other words, they want to keep their identity under wraps.