These are also called blocked, hidden, masked, or unknown calls. “No Caller ID” is typically what you'll see on the caller ID for a blocked call on an iPhone, but other phones may use a different term in the 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.
How to Block No Caller ID on the iPhone 10, 11, and 12
How to Block No Caller ID on the iPhone 6, 7, and 8
How to Block No Caller ID on an iPhone in Australia
Unlock your iPhone and locate the Settings icon. Apple depicts this icon as a small, grey gear. Tap on the Settings icon, scroll through the menu and select the Phone option. In the menu that opens, navigate to the Silence Unknown Callers option and slide the toggle to the right to turn on the feature.
Block or unblock calls from your device.
Block No Caller ID Using Contacts Go to “Contacts“, tap the “+” sign at the top right corner. Enter 000-000-0000 for the phone number. Next, open the phone app, find the new contact you just created and select it. Scroll down and tap “Block this caller“.
you can block all numbers not in your contact list by doing this:
1:222:41Then select do not disturb beside where it says manual. At the top of your screen you'll see aMoreThen select do not disturb beside where it says manual. At the top of your screen you'll see a slider. Move the slider to the right to enable customization of the do-not-disturb. Setting.
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.
Create a New Contact. The third way you can block unknown numbers is by creating a new contact that you can name “Do Not Answer” or “No Caller ID.” Unfortunately, your iPhone is unable to block hidden or private numbers because it cannot recognize them.
Another way to block no caller ID on iPhone is to make use of the Do Not Disturb mode. This allows you to ensure that when this mode is turned on, the only calls that you will receive are from people in your contacts.
Caller ID is a free service at T-Mobile that displays a caller's name and number even if they're not in your contact list. All T-Mobile customers with 12 voice lines or less are eligible for free Caller ID. Caller ID name displays the name, city, and state of incoming calls if they are not already stored in your phone.
To deactivate Caller ID Blocking for a specific number: