Thanks for reaching out! We'd be happy to help. You can view our Call Protect support article to learn more about the feature. Look below the Opt in to start using call protect section, and follow the instructions to set it up on your specific device. Let us know if you have any further questions!
Collin, AT&T Community Specialist
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One line, but you can add the app to each phone if you choose.
If I block a number will it be blocked for all lines.
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