The best and easy way to block any incoming number from android phone will be by using using an app called Call Control – Call Blocker.
Call Control is full featured, super easy to use and is trusted by more than 5M users to block unwanted calls and texts. With Call Control – your phone only rings when you want it to.
– Automatically blocks thousands of active spam callers reported by the community.
– Community Blacklist stops telemarketers, debt collectors and other spam calls before they bother you.
– Personal Blacklist lets you block any phone number or area code (3 entry limit in Lite version)
– Reverse lookup for spam callers to find out who`s calling (and it`s free).
– Powered by the FCC Do Not Call Registry
– Blocks reported offenders automatically.
To install this app Android version 1.5 and up. Simply install the app and block all the number who are disturbing you.
Apart from this there are some other apps as well available in the playstore, you can also check them
– Calls Blacklist – Call Blocker
– Call Blocker