The basic method: use your phone's built-in block feature

Most landline phones made in the last 15 years have a call-blocking button or menu option built directly into the handset or base unit. The exact steps depend on your phone model, but the general process is: write down the number you want to block, pick up the handset, press a button labeled "Block," "Reject," or sometimes a number like "7" or "9," enter the phone number, and confirm. The phone then refuses incoming calls from that number.

Check your phone's manual or the manufacturer's website for the exact button sequence — different brands use different layouts. If you have lost the manual, search online for "[Your phone brand and model number] how to block calls" and you will usually find a PDF or video walkthrough. Common landline phone makers include Panasonic, VTech, AT&T, and GE, and most have support pages with step-by-step instructions.

This method works only on that specific phone. If you have multiple handsets on the same line, you will need to block the number on each one separately, or use your phone service provider's blocking option instead.

Key Takeaways

  • Most modern landline phones have a built-in block feature accessible through a button or menu on the handset itself.
  • Your phone company can block numbers at the network level, which stops the call before it reaches any phone in your home.
  • Network-level blocking usually costs between $3 and $5 per month, though some providers offer a limited free tier.
  • If a blocked caller uses a different number, neither method will catch them — blocking works only on the specific number you enter.
  • You can also refuse to answer calls from unknown numbers and let them go to voicemail, which is free and requires no setup.

Blocking at the phone company level

Your landline provider — whether that is AT&T, Verizon, Comcast, or a local phone company — can block numbers before the call even reaches your home. This is called network-level blocking or carrier blocking. It stops the call at their equipment, so it does not ring any phone in your house.

To set this up, call your phone company's customer service number (usually on your bill) and ask for call blocking. They will ask you for the number or numbers you want blocked, add them to your account, and the blocking usually takes effect within a few hours. Some providers let you manage your blocked list online through your account portal instead of calling.

Most phone companies charge a monthly fee for this service — typically $3 to $5 — though some offer a limited free version that blocks a small number of numbers (often 10 to 30). If you are blocking only one or two numbers, ask whether the free tier is available before paying for the full service.

The difference between phone-level and network-level blocking

Phone-level blocking (using your handset's built-in feature) stops the call at your phone only. The call still reaches your phone line, but your phone refuses to ring or display it. If you have multiple handsets, the call will still ring on the others unless you block it on each one. This method is free and requires no monthly fee.

Network-level blocking (through your phone company) stops the call before it reaches your home at all. No phone in your house will ring, and you will not see the call in your phone's history. This works across all handsets on your line automatically, but it usually costs money and requires you to contact your provider to add or remove numbers from the blocked list.

For a single unwanted caller, phone-level blocking is usually enough and costs nothing. For repeated calls from multiple numbers, or if you want the call stopped before it reaches your home, network-level blocking is more convenient despite the monthly cost.

What to do if the caller uses different numbers

Blocking works only on the specific number you enter. If someone is calling you from different numbers — a common tactic with spam and scam callers — you will need to block each number separately as it appears. This can become tedious quickly.

Some phone companies offer a "block all unknown numbers" or "block anonymous calls" feature that stops any call that does not display a caller ID. Ask your provider whether this option is available. Be aware that some legitimate callers (hospitals, government offices, some businesses) also block their number from showing, so you might miss important calls if you use this setting.

If blocking individual numbers is not working, consider not answering calls from numbers you do not recognize and letting them go to voicemail. Legitimate callers will leave a message. Spam and scam callers usually hang up without leaving one. This approach requires no setup or monthly fees.

Blocking calls from private or unknown numbers

Some callers block their number from showing up on your caller ID — these appear as "Private," "Unknown," "Blocked," or a series of zeros. You cannot block a private number the same way you block a regular number because there is no specific number to enter.

Instead, ask your phone company about a "block anonymous calls" or "reject private calls" feature. This tells your phone system to refuse any call that does not display a number. The call will not ring through, though the caller may hear a message saying the number does not accept private calls.

The downside is that some legitimate callers use private numbers — hospitals calling about test results, government agencies, some businesses. If you use this feature, you might miss important calls. A safer approach is to simply not answer calls from private numbers and check your voicemail later.

When blocking does not work

Blocking a number stops calls from that specific number only. It does not stop the caller from trying again with a different number, using a spoofed number (a fake number that looks local or official), or calling from a different phone entirely. If someone is determined to reach you, blocking one number is only a temporary solution.

If you are receiving repeated harassment or threats, contact your local police department and ask about filing a report. You can also report spam and scam calls to the Federal Trade Commission at reportfraud.ftc.gov. Neither action will stop the calls immediately, but both create a record if the harassment continues or escalates.

If the calls are from a business or debt collector, you have additional legal protections. You can send a written request to stop calling, and in some cases, you can demand they stop calling your landline entirely. The rules vary by state and by the type of caller, so consider consulting a local legal aid organization if the calls are persistent.

Frequently Asked Questions

Can I block calls on a landline without a caller ID box?

Not through your phone's built-in feature — that requires caller ID to work. You can only block through your phone company's network-level service. Call your provider and ask about their call-blocking options. Some older landline systems do not support network blocking either, in which case your only option is to not answer calls from numbers you do not recognize.

Will the blocked caller know they are blocked?

With phone-level blocking, they will hear the phone ring normally on their end, but your phone will not ring. With network-level blocking, they may hear a message saying the call cannot be completed, or the call may simply fail. Either way, they will know something prevented the call from going through, but not necessarily that you blocked them specifically.

Can I unblock a number if I change my mind?

Yes. On your phone, go back into the block menu and look for an "unblock" or "remove" option — the exact steps depend on your model. With your phone company, call customer service and ask them to remove the number from your blocked list. This usually takes effect within a few hours.

Do I have to pay for call blocking?

Phone-level blocking (on the handset itself) is free. Network-level blocking through your phone company usually costs $3 to $5 per month, though some providers offer a limited free version that blocks a small number of numbers. Ask your provider what is available before you commit to a paid service.

What if I want to block all calls except from people on my contact list?

Most landline phones and phone company services do not offer this "whitelist" feature — they can only block specific numbers or categories (like private calls). This feature is more common on cell phones. Your best option is to block the most frequent unwanted callers individually and let other unknown calls go to voicemail.