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Android: How to block SMS from unknown numbers

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You don't want to receive SMS from unknown numbers anymore? We'll show you how to prevent this on Android phones.

Spam messages not only reach you by email, but now also often by SMS. A prominent example of this is currently the message "Your package has been sent". You can mark such messages as spam on your Android phone in the SMS app and block the contact.

However, this is usually not an effective protection, as the block only applies to the respective sender. However, since cyber criminals are constantly changing numbers during their spam attacks, it is advisable to set up a general block for SMS from unknown numbers. This can be done, for example, with the app "Blocks calls and SMS - Calls Blacklist"

How to set up such a block with "Block calls and SMS - Calls Blacklist", we will show you below:

How to block SMS from unknown numbers with the app

  1. 1

    Install the app, open it and grant it the required permissions. To block SMS from unknown numbers, you have to make the app your standard SMS app.

  2. 2

    Then tap on the three lines in the top left corner of the app.

  3. 3

    Select "Settings" in the menu that now opens.

  4. 4

    Then tap on "Block"

  5. 5

    Scroll down to the menu item "SMS". Make sure that the switch is blue here and check the box next to "unknown numbers".

  6. 6

    Messages from unknown numbers should now be blocked.

Incidentally, Samsung phones also have integrated protection against spam calls, which you can activate in just a few steps.

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