How can I block unwanted calls for Verizon Wireless cell phones?

Q. How can I block unwanted calls for Verizon Wireless cell phones?
A.
1. Sign In to your Verizon Wireless account.
2. Click 'My Services' on top of home page.
3. Find 'Spam Controls' services and click on 'Call & Message Blocking'.
4. Enter up to 5 numbers to block.
5. Apply.
All number will expire after 3 month.
After this period you can re-apply again the same number.
Service is available from April, 2010