From a device that is connected to the AT&T Wireless Internet network, open the web browser and go to http://att.wirelessinternet. Enter your Admin login, then click Login. Note: The default admin login is attadmin. The admin login can be found on the bottom of the device.
BLOCK PHONE NUMBER: Click Call Log, then click the checkbox next to the desired phone number you wish to block. Click Block.
UNBLOCK PHONE NUMBER: Click the checkbox next to the desired phone number you want to unblock, then click Delete. Note: You will be prompted to click Yes to confirm.