You can block or unblock a number on an Android phone using the built-in Phone app's "Blocked numbers" menu.

You can set up voicemail on your Android phone directly from the phone's keypad or its Voicemail app if it features one.

This article explains how to set up voicemail on all Android phones regardless of the manufacturer (Google, Samsung, etc.). How to Set Up Voicemail on Android by Calling In The most common way to set ...