Log into your Verizon wireless account on the internet. Make sure that you log into the phone number you want to block numbers from calling if you have more than one line. Select the My Services tab, then my cell phone and then select Verizon safeguards. Choose the Spam Controls tab and click on call and message blocking. Then enter the phone numbers that you want to block from contacting you. Then hit apply, click the box that says apply these settings to all eligible lines if you want the number to be blocked from calling any cell phone number on your account.