Calls Blacklist is both a call blocker and an SMS blocker. It can easily block calls and messages from unwanted, private (hidden, anonymous) or unknown numbers.

how to block a phone number:

Block unknown caller & calls blacklist from those you don’t want to be able to contact you, so how to block number when calling?
Prevent harassment by blocking unwanted phone calls.Call blocker blocks unwanted calls by call block caller id you can add any number to the blacklist or enable one of blocking options: "Block Blacklist", "Block Private Calls","Allow Whitelist" or "All calls".

SPAM BLOCKING:
If you are tired of annoying calls or messages: telemarketing, spam and robocalls, then Calls Blacklist is your solution. It is very easy and lightweight, yet powerful call blocker.
The only you need is to add unwanted numbers to the blacklist.

?BEST FEATURES:
✔️ Block calls and SMS using blacklist.
✔️ Block unknown numbers.
✔️ Block private/hidden numbers.
✔️ Block a range of numbers using the "Begins with" option.
✔️ Block SMS from alphanumeric numbers.
✔️ Block SMS by text.
✔️ Block all numbers.
✔️ Block all calls while audio chat or VoIP call is established.
✔️ Use "Whitelist" to prevent block of certain people.

? Call Blocker Features :
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You can search for App by :
Bloquer un numéro : appels & SMS - Calls Blacklist
Call Blocker Free - Blacklist
Bloqueur d'appels
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le plus sûr blocage d'appel
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Calls Blacklist PRO