Access Wireless.att.com in your computer’s Web browser. Click “Login” and enter your account information. If this is your first time accessing your online account, register for a new account. Hover over “Wireless” in the top menu and click “Smart Limits.” Click the phone on the account for which you want to block incoming texts. Click “Allowed Numbers” in the side panel. Enter at least one number in the field. To prevent texts from any numbers, enter the AT&T cellphone’s 10-digit phone number in the “Add New” field. The system will recognize it as the only number allowed to text the phone. Texts from all other numbers will be blocked. Click “Logout” to exit the system and save your settings.
