How To Block Any Unknown Number In Android HindiUrdu | Time X Tv br In this video, i am going to explain how to block any unknown number on android. This is the very simple and easy method. Download the Nr.Number app from the google play store and just follow these simple steps. Block unwanted calls. Identify & stop spam calls and SMS texts. Block calls from one number or the world, identify and stop spam. br Mr. Number is the most powerful call blocker on the market.