How to Block a Phone Number From Calling Your Android Phone
 

Blocking a phone number from calling you should be fairly simple in 2013, but it still isn’t. Android doesn’t have a completely integrated blocking solution, and carriers don’t generally offer this basic service for free.

Luckily, there are a variety of ways to block calls anyway, whether you’re dealing with telemarketers that won’t stop calling or other annoying people that just won’t leave you alone.

http://www.howtogeek.com/171012/how-...android-phone/