You can also monitor and limit minute, text and data usage for as many as 10 devices on your Verizon account. With Verizon's Family Base  option, you can block calls from both domestic and international numbers, email addresses and instant messenger screen names, as well as restricted, unavailable or private numbers.  The service also lets you block calls during a certain time of day and prevent outgoing calls to 411 directory assistance. Choose the, "Controls," option, followed by the, "Blocked Contacts," tab. Locate the line to which you want to block calls, and choose the, "Add Blocks," option. Select whether the number is a domestic or international number from the drop-down box. Click, "Add." Choose whether it's an email address or screen name from the drop-down box. Click, "Add." After you click, "Add Blocks," however, check the box next to, "Block Restricted, Unavailable and Private Numbers." Click, "Add."

Summary:
Block as many as 20 contacts permanently for just $5 each month. Visit Verizon's Family Base page. Enter the name of the contact to be blocked, as well as the phone number to be blocked, in the appropriate fields. Block unwanted messages from email addresses and screen names using the same process and entering the email address or screen name into the, "Contact Info," field. Block all calls from restricted, unavailable and private numbers using the same steps.