Root Call SMS Manager is a free Android app that lets you block calls and texts.

It works with Android 4.0 or later and requires root privileges. It doesn't need any other root or special permissions.

This tool can be used to block calls and texts on your Android phone or tablet. It has a very simple user interface and is easy to use.

You can use it to restrict calls from a number that is on your contact list or from the one that you specify. You can also block SMS messages from the sender.