But in Android, it's different. There is no need to turn off your phone or set it to air plane mode, but you can add that particular number to a blacklist and he/she will never bother you again. For this guide, we will be uing the magnificent app called Call block.
Call block, is a free ad-supported app which gives you the ability to add certain numbers to a blacklist or just even block absolutely any calls aswell as messages. Not only that, but it also saves records.
And good news for non-rooted users, this app does not require your device to be rooted!
Download the app Call block from the Play Store and follow the instructions in the video below: