AT&T's call blocking service allows users to block up to six incoming phone numbers from ringing on a landline. When a phone number is blocked and someone from that number calls your AT&T landline, he receives a message that you are not accepting the call. You may block an incoming phone number on an AT&T landline by following a few specific steps.
Pick up the receiver on your AT&T landline phone and listen for a dial tone. Press *60 and press #. Wait for another dial tone.
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Dial the first number, including the area code, that you wish to block on your AT&T landline. Press #.
Listen for another dial tone, dial the second number that you wish to block then press #. Repeat this step to block up to six numbers.
Hang up your phone. The phone numbers you entered are blocked.
Things You'll Need
Phone number that you wish to block
The AT&T landline call blocking service does not allow users to block calls from wireless phones or pay phones.