Here is our step-by-step guide on how to block annoying calls from unknown phone numbers on Android. Below you will find detailed guides on how to do this on various devices running different versions and ROMs including stock Android, OneUI, OxygenOS, EMUI, MIUI, etc.
The Problem of Spam Calls
As you might know, nearly a half of all incoming calls are spam nowadays. Telemarketers use various tricks to get to you: sometimes they change the phone number to a local one, another time they try to hide the number to make you curious about who is calling you from private number and answer. The only goal, as a rule, is to sell you some product or service.