Alltel :

How to Block Text Messages:
Before proceeding with the following steps, ensure that the auto signature feature is turned off for outgoing text messages.

From your wireless phone, create a new text message using the following guidelines:

•Enter 8888 for the recipient
•Within the message body, type B and the ten digit phone number you would like to block, (For example B 3084234567), then send the message. Notice the space between B and the phone number is mandatory
•Once the message has been sent, Alltel will block the number from ever sending you text messages again