5 Methods to Block Unknown Caller and No Caller ID on iPhone

November 27, 2019Nicole Jones

You might receive continuous nuisance calls from telemarketers, spammers, unknown callers and more. How to block unknown callers or No Caller ID on your iPhone? In order to prevent these unknown calls, you should learn more about 5 frequently used methods from the article.

Whether you need to block a specific call, an unknown call, No Caller ID on your iPhone, or even permanently erases call history to protect your private, you can learn more details from the ultimate guide now.

Block No Caller ID on iPhone

Part 1: How to Block a Caller on Your iPhone Directly

If you received many calls from the blocked caller ID or one unknown caller, you can simply block the caller on iPhone. As for the case, the telemarketer will no longer bother you again.

Step 1:
Open the "Phone" app from your iPhone and tap the "Recents" tab to locate and choose the nuisance call.
Step 2:
Tap the "i" icon in the left of the call, scroll down to choose the "Block this Caller" option to block the caller on your iPhone.
Step 3:
Confirm the decision to press the "Block Contact". The block feature will apply to calls, text messages and FaceTime calls.
Block a Caller on iPhone

Part 2: How to Block No Caller ID Calls via Contacts

What should you do if there is only a "No Caller ID" call? You can name the new contact "No Caller ID" and block No Caller ID call on your iPhone as the following steps.

Step 1:
Launch the "Phone" app and tap the "Contacts" option to add a new contact as "No Caller ID".
Step 2:
Tap the "+" button to add a new contact. You can enter the 000-000-0000 as the contact number.
Step 3:
Now you can scroll down and tap the "Block this Caller" option to block the phone number on iPhone. After that confirm to block the No Caller ID on your iPhone.
Block No Caller ID Calls

Part 3: How to Block Unknown Callers from "Do Not Disturb"

In order to block all unknown calls on your iPhone, you can choose the default "Do Not Disturb" option. It is a method to enable you silence calls for the numbers you have not added to your address book.

Step 1:
Go to "Setting" on your iPhone and choose the "Do Not Disturb" menu to block the unknown calls on your iPhone.
Step 2:
Choose the "Allow Calls From" to set up the desired contacts you want to "Allow Calls From".
Step 3:
If you choose the "All Contacts" option, it will block the unknown calls on your iPhone and received calls from your contact list only.
Block Unknown Callers

Part 4: How to Block Private Numbers on iPhone via a Call Blocker

Of course, you can also take advantage of some call blockers or contact management apps, Truecaller is one of the most popular call blocking app on iPhone to avoid spam calls and SMS.

Step 1:
Download and install Truecaller from App Store. Launch the app and enter the mobile number. Tap on the "GET STARTED" to activate.
Step 2:
Confirm the agreement and enter the received OTP to continue the installation process. Tap on the "Allow Permission" to continue.
Step 3:
Go to "Settings" > "Phone" > "Call Blocking & Identification" to enable the Truecaller app on iPhone.
Step 4:
Open the app and tap on the "menu" icon, go to "Settings" > "General" and scroll down to find "Missed call notifications".

In the way, all the missed call notifications will come from Truecaller instead of your stock dialer app. Moreover, if you have deleted the missed calls from the blocked contacts, just check the details here to recover the deleted calls on iPhone.


Part 5: How to Block No Caller ID Calls via Cellular Carriers

What should be the ultimate method to block No Caller ID calls on your iPhone? When you need to block the telemarketers and spammers completely, you can just call the cellular carrier for help.

You can also search for the blocking features available to block the unknown and anonymous callers, it is the basic feature provided for most of the cellular providers.

Part 6: How to Permanently Erase Call History to Protect Your iPhone

Besides the method to block No Caller ID calls on your iPhone, you might also need to erase call history on iPhone completely to protect your iPhone. FoneEraser is the most powerful utility to erase all iPhone contents and settings permanently.




  • Protect your private and clean up the call history on iPhone with ease.
  • Remove the call histories, text messages and others completely.
  • 3 different erasing levels to clean up iPhone data for different requirements.
  • Support iPhone 15/14/13/12/11/XS/XR/X/8/7/6 with the latest iOS 17.
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Step 1:
Connect iPhone to computer via a USB cable
Download and install the FoneEraser on your iPhone. Launch the program and connect iPhone to computer via the original USB cable. It is able to detect the iPhone automatically.
Step 2:
Choose the erasing level to clean up data
In order to remove the call histories and other information completely, you can choose the Low level instead. It just overwrites all the data on the device with zero files to ensure the files cannot be recovered.
Choose Level
Step 3:
Erase the call histories and other information
After that, you can click the "start" button to remove the call histories as well as the other information on iPhone. Moreover, there is no method to retrieve the erased files on your iPhone any longer.


When you need to block No Caller ID or unknown calls on your iPhone, here are 5 frequently used methods for different situations. Just choose the desired one according to your requirements. If you have any query, you can feel free to leave more comments in the article.

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The most powerful utility ever, allowing users to erase all iPhone content like contacts, messages, photos, videos, notes, etc. and settings permanently and thoroughly.

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