A free app for Android, by LiteWhite.
AntiNuisance - Call Blocker and SMS Blocker is an Android app that will help you block unwanted calls and SMS. You can use it on any Android device, even if you have an Android phone or tablet.
The app has an easy-to-use interface that will help you quickly and easily configure your settings. It also has several options that will let you customize the blocking experience.
You can block all numbers with an area code, prefix, or postfix. You can also choose to block incoming messages from a number, and it will work even if that number is on another line.
AntiNuisance - Call Blocker and SMS Blocker can block calls and SMS from anyone.
