How to enable Call Control in iOS.
Here’s a step-by-step guide to help you enable Call Control to block unwanted calls in iOS.
Step 1: You will need to enable Call Control as the default Call Blocking and Identification app within iOS. This is an iOS requirement and not a requirement placed by Call Control itself.

Step 2: Open your settings
Step 3: Tap the phone icon

Step 4: Tap Call Blocking & Identification

Step 5: Enable Call Control

Step 6: Return to Call Control app. Now Call Control can automatically block robocalls from calling your phone!

*Hint: You can confirm that your account has been upgraded by going to the main Activity screen and seeing the Active cellphone protection status