How to stop ‘Anonymous’ phone calls on your landline

Last year, I did a post on “Why the FTC’s Do Not Call registry doesn’t stop those annoying robo-calls — and how you can stop them”.

After I signed on to a service called Nomorobo, which blocks robo-calls free for landline phones but costs $1.99 a month for mobile phones, most of the robo-calls I get indeed are blocked. How I know is when a call comes in, the phone only rings once, then the call is referred to Nomorobo.

But Nomorobo (to which I donated) still does not block all nuisance calls. I’ve noticed that some calls still get through, which my landline phone’s Caller ID identifies as “Anonymous”.

Well, there is a way to block “Anonymous” calls as well! Alas, it works only with some landline phones Xfinity, AT&T and Verizon, but not T-Mobile and Sprint.  

Craig Johnson of tells us how:

If your landline phone service is with Xfinity:

  • On your home phone, lift the receiver and listen for the dial tone.
  • Press *77 and listen for a confirmation tone. That’s how you know that the feature is working.
  • The “anonymous” caller who is blocking the display of their name and number will hear an automated recording that you’re not accepting blocked calls, and that to call again they must to unblock their Caller ID.
  • To turn off the Anonymous Call Rejection feature, press *87 and listen for a confirmation tone. When you hear it, the feature has been deactivated.

If your landline phone service is with AT&T:

  • Open the Customer Portal online and click the Inbound Features tab.
  • If Anonymous Call Rejection is enabled, to the right of it, under Action, click the Edit icon. Click yes or no and save.

If your landline phone service is with Verizon:

Even after you’ve activated the Anonymous Call Rejection feature on your landline phone, there are at least three kinds of calls that you’ll still receive:

  • Operator-assisted calls.
  • Calls that come up as Unknown or Unavailable.
  • Calls that are listed as Out-of-Area.

Note that the *77 feature won’t stop anonymous calls on your cell phone. Depending on the cell phone carrier, pressing *77 will either result in a “call could not be completed” prompt or in some areas of the United States, pressing *77 on your mobile phone will connect you to either the police or public safety officials.

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6 Comment authors
AnonymousAuntie LuluAlmaJJJJ Recent comment authors
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I always give them a reverse obscene call! I act like I am getting off and ask them about their sex life while moaning… That usually ends the call… If they sound like they are from India I say “Bunda-Mur-WAH” which I was told is “Go Fuck Youself”…. If it is a female I say “Moe-gogo-Chi-Chi-WAH” which I was told means “You stink like the river”… That usually stops most calls. I cancelled my land line years ago because the only calls I would get were bill collectors looking for my deadbeat mother and brother…


My little county phone service doesn’t apply with Nomorobo.
Well, I guess I’ll just leave the ringer in off position.

I don’t have a cell phone either…don’t know anybody; no neighbors, friends, or family.
Oh, I do have a tracfone for emergencies when I’m out. $22.12 every 90 days with 120 minutes.


Oh, the only person with my cell # is my I wouldn’t answer ever if it’s not him.


Thank you, I have Xfinity for my land line and ATT for my cell. Great info.

Auntie Lulu
Auntie Lulu

I think that it is extremely interesting that we have so many “Hollyweird” types who hold themselves up to be paragons of virtue . . . . doesn’t this just make you wonder how they could have possibly stooped so low? The one thing that may well have played a roll in deciding to enter into these “bargains with the devil,” is that the alumni of these prestigious schools look out for new graduates–they make sure that the new alumni coming up thru the ranks get hired at these prestigious Universities, get hired at Fortune 500 companies, etc. even though… Read more »


Have an answering machine screen calls… cold-callers hang up.