How to block calls from unknown numbers on Android and iPhones?

Unwanted calls are one of the downsides of always having a phone in your pocket. You could make the call go unanswered, but that would still be annoying. Android or iPhone users can avoid this by blocking unknown numbers. Here are all the ways you can block unknown numbers on an Android and iPhone.

All of us love using the phone to send and receive information to make our lives easier. However, using a phone today has become a bit of a challenge. A big reason for this is annoying calls from spam callers, telemarketers, and cold calls from companies related to their products and services. Additionally, such callers hide their actual caller ID by using the private number function. You can easily block such callers on your Android phone if you are upset or frustrated by them.

It is possible to block all unknown numbers on your Android device, potentially saving you a great deal of time. A particular number can also be blocked on a case-by-case basis, and they can also be unblocked easily. Android and iPhone both have inbuilt features for blocking annoying calls, private numbers, and unwanted calls. You can download a third-party app that can block unknown calls if your device does not offer such an option. Nevertheless, it is not advisable to block private numbers. In this setting, all private numbers will be blocked, so if your family or friends use hidden numbers, they will also be blocked.

What is an "unknown" number?

This post will show you how to block calls from "unknown" numbers. But what does that mean? The service blocks call from numbers that don't appear on the caller ID. As on iPhone, it will still be able to block calls from numbers not in your contacts. Unlike known numbers, unknown numbers do not display a number on caller ID. Unknown numbers that appear on your caller ID are not blocked. Either way, you should make sure that you only block spam phone numbers. Here is a guide to help you identify scam phone numbers so that you do not block someone whose call might be important.

There are features in both Android and iOS that allow users to block all calls from unknown numbers. You need to do the following:

How to block calls from private numbers on Android?

Blocking private numbers on your phone (Android or iPhone) is not always a good idea. Your friends or family who use hidden numbers will also be blocked by this setting. We have listed the steps below for blocking private numbers in Android.
  • Open the phone app on your phone.

  • Tap More to see more options.

  • The third step involves tapping Settings and selecting Blocked numbers.

  • The next step is to enable the Unknown option.

Your smartphone's Phone app blocks call from private and unidentified numbers when you enable this feature. Nevertheless, you will continue to receive calls from phone numbers that are not stored in your contact list.

The steps can differ slightly depending on the device you are using. The steps you have to follow may differ depending on whether you are using a Samsung phone or a Realme phone, for example. This is an additional guide to help you navigate various user interfaces.

How to block unknown numbers from calling your Samsung Phone

  • On your Samsung phone, open the Phone app.

  • The second step is to tap on More Options which can be found at the top right corner of the screen.
    Tap the Settings option now.

  • The next step is to tap the Block numbers option.

  • The next step is to toggle on the Block unknown/private numbers option.

How to block unknown numbers from calling your Realme phone

  • On your Realme smartphone, open the Settings app.

  • In Step 2, tap Privacy, followed by Harassment & Fraud Prevention.

  • Next, tap Block & Filter, followed by Block Calls.

  • The fourth step is to tap Block Calls from Unknown Numbers.

  • Next, specify the blocking conditions, such as the number of days and the duration of the blocking. In case you receive repeated calls from a number, you can also set your phone to ring.

How to block unknown numbers from calling your Xiaomi phone

  • On your Xiaomi smartphone, launch the Phone app.

  • The next step is to tap the three-dot button at the top.

  • Now, go to the Settings menu and select the Settings option.

  • The next step is to complete the process by selecting Block all calls from unidentified callers.

How to block unknown numbers from calling your iPhone

  • On your iPhone, open the Settings app.

  • The second step is to go to the Phone settings.

  • Tap Silence Unknown Callers in Step 3 to silence unknown calls.

  • In this step, you will toggle on the Silence Unknown Callers button.

Activating this feature will silence all calls from unknown numbers, send them to voicemail, and display them in Recents. However, you will continue to receive calls from your contacts, recent outgoing calls, and Siri suggestions.

Use a third-party app to block a phone number

Alternatively, if you don't have an in-built feature to block a phone number on your Android device. Another option is to use a third-party Android app that blocks numbers or calls. Here, we'll look at how to block a phone number on Android using some third-party apps.

Mr. Number

In the absence of built-in call blocking on your Android phone, you can download a third-party app of your choice to block unknown numbers. The Mr. Number app is available for Android phones. Download it and wait for it to initialize. You are asked to verify your phone number and country, but you can skip it if you wish. If you want to use its number lookup feature, you should verify your number and country. It is possible to block an individual, a country, or even an entire area code with this app.

  • Lookup Number
    Click on one of the caller numbers. Tap the Lookup Number option if the caller's number is marked as an Unknown Number. Using the web, it will try to find out who called you. With its free version, you'll get 20 free lookups per month or more through in-app purchases. Additionally, you can also send a text message or make a direct call to the unknown incoming number using the message or call icons, respectively, at the bottom of the screen.

  • Block a number
    At the bottom-left of the screen, tap the Block icon to block a number. The next screen will ask you to decide whether you want this number to be blocked automatically or transferred to voicemail. It is also possible to mark the call as spam if it is a junk caller. In its database, the app adds that number as a spammer; you can also add a comment, such as the company making the call. Click "Done" when you're finished.

  • Block all unknown numbers
    Mr. Number also lets you block every unknown caller. Go to the main screen of the app and select Block List. Swipe to the Voicemail tab and tap Send Someone to Voicemail at the bottom of the screen. Tap the All numbers option, not the My contacts option, from the pop-up options. Your voicemail will now receive calls from unknown numbers that aren't saved in your contacts, while your saved contacts will continue to receive calls normally.

Block unknown numbers on Stock Android

Another popular third-party app that blocks unknown numbers on Android phones (Stock Android) is Should I Answer? You can set this app to reject all unknown calls, including calls from numbers that aren't saved in your contacts list. Here are the steps to be taken to block unknown numbers on your phone:
  • Install the Should I Answer app on your Android device.

  • Click on the Open button in Google Play Store or launch the "Should I Answer?" app from the App Drawer.

  • To continue, click on the Continue button at the bottom of the screen.

  • Go to the Settings tab.

  • The "Block Incoming Calls from" option can be found in the same Settings screen.

  • Enable any or all of the following toggle buttons under the "Block Incoming Call from" section:
    • local negatively rated numbers

    • community negatively rated numbers

    • numbers not stored in contacts

    • hidden numbers

    • foreign numbers

If necessary, you can also block or prevent unknown numbers from texting you. You can do this by scrolling down to the "Block SMS & MMS from" section and enabling the toggle button next to the options you want to block.
  • local negatively rated numbers

  • community negatively rated numbers

  • numbers not stored in contacts

  • You can now exit the app settings after saving your settings and calls from unknown numbers will be blocked.


Now you're ready to go! Your phone will no longer ring when you receive a call from an unidentified number. This will hopefully reduce the number of calls you must ignore.


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