“If you receive a call stating No Caller ID, it means that the caller is trying to hide his number from you whereas Unknown caller means your mobile operator hasn't interpreted the number.” Furthermore, they suggested ways to counter such anonymous callers, such as declining calls, using third-party apps, etc.
How to Block No Caller ID on the iPhone 10, 11, and 12
It means that the caller has deliberately hidden their number from showing up on your screen when making calls. If the call is from an unknown caller, then your carrier provider couldn't identify the number.
Fun fact: if someone calls you and it says “No Caller ID” it's someone on your contact list. If it says “Unknown” then it's an unsaved number.
Fun fact: if someone calls you and it says “No Caller ID” it's someone on your contact list. If it says “Unknown” then it's an unsaved number.
Navigate to Settings from your Home screen. Once in Settings, locate Phone and tap on it. Move down the menu until you find the Silence Unknown Callers option and slide the toggle to the right to enable it. The toggle should turn green when activated.
Conversation. Fun fact: if someone calls you and it says “No Caller ID” it's someone on your contact list. If it says “Unknown” then it's an unsaved number.
When your call is successfully made, the receiving end's caller ID will show “Private” as your number on their phones. If you are wondering how to return a call from a number that recently called you without revealing your identity, dialing *67 is the fastest and easiest method.
To check the on-device Caller ID Block option, go to: Settings > Phone. Under the Calls section there will be an item named Show My Caller ID. To block your Caller ID, set the toggle to Off.
The iPhone's Caller ID feature is what lets the person you're calling know it's you; it's what pops your name or number up on their phone's screen. To block Caller ID, change its setting.
How to Silence Unknown Callers on iPhone
1. Find "Show My Caller ID"
Open the Settings app on your iPhone. Scroll down and tap on Phone. Scroll down again and tap on Silence Unknown Callers. Toggle the switch to activate the Silence Unknown Callers feature.