Three ways to stop unwanted calls on a landline phone
You can block unwanted calls on a landline through your phone service provider, using a device that sits between your phone and the wall jack, or by screening calls manually before you pick up. The fastest option depends on whether your provider offers call blocking, how much you want to spend, and whether you're willing to let calls ring before deciding to answer.
Most landline providers now offer some form of call blocking at no extra cost or for a small monthly fee. If your provider doesn't, a standalone call-blocking device costs between $40 and $150 and requires no monthly payment. Manual screening — using a answering machine or letting calls go to voicemail — is free but means you hear the phone ring every time.
Key Takeaways
- Your landline provider may offer free or low-cost call blocking through your account settings or a phone feature you can set up by dialing a code.
- Standalone call-blocking devices plug into your phone jack and filter calls before they reach your phone, with no monthly fees.
- Some devices let you create a whitelist of numbers you want to reach you while blocking everything else, which is useful if you get many spam calls.
- Call blocking works best when combined with not answering unknown numbers and letting calls go to voicemail so you can screen them first.
Call blocking through your phone company
Most major landline providers — including AT&T, Verizon, CenturyLink, and Frontier — offer call blocking features. Some are free; others cost $3 to $5 per month. The feature may be called Call Filter, Call Block, Nomorobo, or something similar depending on your provider. Contact your provider directly to ask what they offer and whether it's already included in your plan.
If your provider offers a free feature, you usually turn it on through your online account or by calling customer service. Some providers let you set up blocking by dialing a code from your phone — for example, dialing *60 on some AT&T lines activates call blocking, and you can then enter numbers you want to block. Check your provider's website or your phone bill for the exact code and instructions.
Provider-based blocking typically works in one of two ways: it either blocks specific numbers you add to a list, or it uses a database of known spam numbers and blocks them automatically. Automatic blocking is more convenient but may occasionally block legitimate calls. Number-by-number blocking gives you more control but requires you to add each number manually.
Standalone call-blocking devices
If your provider doesn't offer call blocking or you prefer not to pay a monthly fee, a standalone device is a one-time purchase that requires no subscription. These devices sit between your phone jack and your phone (or between the jack and your answering machine) and filter calls before they reach you. Common models include the CPF3000 by Clarity, the TrueCaller Box, and the Nomorobo device.
Most standalone devices work by checking incoming numbers against a database of known spam and scam numbers, then either blocking the call entirely or sending it to a separate "blocked calls" list you can review later. Some let you create a whitelist — a list of numbers that are always allowed through — which is useful if you want to block almost everything except calls from family or your doctor's office.
Prices range from about $40 for basic models to $150 for devices with more features. Some devices require you to update their spam database periodically (usually through a phone call or internet connection), while others update automatically. Read the product description carefully to understand what updating looks like and whether it involves a monthly fee hidden in the fine print.
How to set up a device between your phone and the wall
Installation is straightforward: unplug the phone cord from your wall jack, plug the device into the jack, then plug your phone cord into the device. The device sits in the middle and filters calls before they reach your phone. If you have an answering machine, you can plug the device into the jack and the answering machine into the device, or plug the answering machine into the jack and the device into the answering machine — either order works, though the device between the jack and answering machine may give you more control over which calls the machine records.
Once plugged in, most devices need to be programmed with your area code and phone number, which takes a few minutes. Some devices come with a list of known spam numbers already loaded; others read the list the first time you plug them in. After that, the device works automatically — you don't have to do anything except review the blocked calls list if you want to see what was filtered.
Screening calls without a device or service
If you don't want to buy a device or pay for a service, you can screen calls manually by letting them ring to an answering machine or voicemail and checking messages before you call back. This is free but means you hear every unwanted call ring through, and you have to listen to voicemails to know whether a call was important.
Some people use a straightforward answering machine with a short greeting — "Please leave a message" — which discourages telemarketers because they know you'll hear the recording. Others don't answer calls from numbers not in their contacts, which stops the conversation but doesn't prevent the ring. Neither method stops the calls from coming in, but both let you avoid talking to unwanted callers.
What to do if you keep getting calls from the same number
If one number calls repeatedly, you can block it directly through your phone company or device without waiting for a broader solution. Call your provider's customer service line and ask them to block a specific number, or add the number to your device's block list yourself — most devices have a button or menu option to block the last caller.
If the calls are harassing or threatening, document the dates and times, then report them to the Federal Trade Commission at ReportFraud.ftc.gov or to your state's attorney general. If the calls are from a debt collector, you have the right to send them a written request to stop calling, which must be honored within a few days. Keep a copy of any written request you send.
Combining methods for better results
Call blocking works best when you use more than one method. For example, you might use your provider's free call blocking for known spam numbers, add a standalone device to catch numbers not in the provider's database, and let unknown calls go to voicemail so you can screen them. This layered approach catches more unwanted calls than any single method alone.
The trade-off is that more blocking means a higher chance of accidentally blocking a legitimate call — a doctor's office, a delivery driver, or a family member calling from an unfamiliar number. Review your blocked calls list regularly and unblock any numbers that shouldn't have been filtered. If blocking is too aggressive, dial back to one method and accept that some unwanted calls will get through.
Frequently Asked Questions
Will call blocking stop the phone from ringing at all?
It depends on the method. Provider-based blocking and standalone devices usually stop the phone from ringing for blocked calls, though some devices let you choose whether to ring or send calls silently to a blocked list. Manual screening (using voicemail) does not stop the ring — the call still comes through, but you don't answer it.
Can I block calls from a specific area code?
Some standalone devices and provider services let you block entire area codes, though this is risky because legitimate calls from that area code will also be blocked. Most services work better when you block specific numbers rather than whole area codes. Check your device or provider's settings to see if area code blocking is an option.
What if I accidentally block a number I need?
Most devices and provider services keep a log of blocked calls that you can review and unblock. Contact your provider's customer service or check your device's menu to find the blocked calls list, then remove the number from the block list. After that, calls from that number should come through normally again.
Do I need internet for a standalone device to work?
Most standalone devices work without internet — they filter calls using a database that comes pre-loaded or updates through the phone line itself. Some newer devices offer better filtering if they can connect to the internet to read updated spam lists, but internet is not required for basic blocking to work.
Can my landline provider block calls for free?
Many providers include basic call blocking at no extra cost, though some charge $3 to $5 per month for more advanced features. Contact your provider directly to ask what's included in your current plan and what costs extra. If you don't have call blocking yet, asking about it may reveal that you already have access to it.