Block unwanted wireless calls and messages

Block calls and text messages using built-in phone features
To find out if your phone has a built-in feature to block calls and text messages:

1. Go to Device Support and select your phone to complete these steps.
2. Using the search box at the top of the page, search by typing block. 
3. Select the applicable tutorial from the search results. If no tutorials are available for your phone, check with the device manufacturer for further assistance or check out other options below.

Block calls using AT&T Call Protect app
With AT&T Call Protect you can block calls from an unlimited amount of numbers for up to 30 days. If you want to continue to block those calls beyond that time, you can renew those numbers using the app. AT&T Call Protect will automatically block fraud calls and warn you about suspected spam calls. Get more details about AT&T Call Protect and learn how to activate this feature on your phone.

Third-Party apps and services
Check out third-party call blocking apps and services to see if they’ll work with your AT&T wireless service. The CTIA provides a comprehensive list of apps that are available based on your device type:

• iOS
  
• Android
  
• Windows
  
• BlackBerry