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The Best Telephone Call Blocker Devices of 2023 – Reviewed and Top Rated

2,455 Reviews Scanned

Rank No. #1
CPR V5000 Call Blocker for Landline Phones, Home Phones, Cordless Phones – Stop All Unwanted Calls, Robocalls, Scam Calls at a Touch of a Button - Join Over 1 Million Satisfied Customers
  • Are you tired of being bombarded by pesky telemarketers and unwanted calls interrupting your daily routine? Are you tired of having to waste your time answering calls that you don't even want? If so, then the V5000 call blocker with the big red button is the perfect solution for you!
  • Imagine having the power to instantly block any unwanted calls with just the press of a button. No more wasting your time answering calls from telemarketers or scammers trying to sell you things you don't want or need. You have complete control over who can reach you on your home phone. Benefits beyond just blocking calls. It can help reduce stress, increase productivity and provide a safer environment for your family by blocking potential scam calls.
  • But how does it work, you ask? Well, it's simple. The call blocker uses advanced technology to screen 5,000 pre-programmed known nuisance callers. With its large red button, you have the ability to block an additional 1,500 numbers at your discretion. It's easy to block calls as they come in, giving you peace of mind and freedom from unwanted interruptions.
  • But don't just take our word for it. The call blocker has been praised by countless customers for its ease of use and effectiveness. It's a simple and reliable solution that will save you time and frustration in the long run. With over 14,000 reviews, join our 1 Million+ satisfied customers.
  • In conclusion, the call blocker with the big red button is the perfect tool for anyone looking to take control of their phone calls and reduce unwanted interruptions. Don’t let another unwanted call interrupt your day. Click ‘Add to Cart’ now to regain control of your phone with the V5000 Call Blocker.
Rank No. #2
Enf510 Call Blocker for Landline Phones/Answering Machine/Home Cordless Phones, Works with All Analog Telephones, Family Function
  • ★ 2 years warranty , If you have any questions, PLEASE CONTACT CUSTOMER SERVICE, we will reply within 16 hours and solve the problem for you. ★ Lifetime technical support.
  • ★ Blocking the changing number starting with a fixed number, such as 443, 800, 855, 866, 999, 7324, 33626 etc . ★ Blocking International, Private/WITHHELD, VOIP/Out of Area callers.
  • ★ Preloaded with 4000+ most complained caller numbers . And 3000+ manual blocking capacity for building your own database . Touch the BLOCK button on the CALL BLOCKER (OR press "#" then "6" on the phone) - BLOCK Scam / spam and all unwanted calls .
  • ★ FAMILY LIST --- Note: ENF510 does NOT support blocking of numbers outside the FAMILY LIST; its function : Numbers in the FAMILY LIST can call you at any time to avoid being mistakenly blocked by the database or manually. For more information, please continue to this website.
  • ★ No main power required, just plug in the phone line to use . ★ NOTE: enf510 only displays the caller's number, not show caller's name AND CALLER ID SERVICE IS REQUIRED from your phoneline provider for ENF510 to work . ★ Enf510 CALL BLOCKER does NOT support for digital and Internet telephones. ★ If your telephone is a two-line telephone, use a splitter (splitters are NOT included in this item)
SaleRank No. #3
Call Control Home - WiFi. Automatically Block Calls! Blocks All Spam Calls, Robocalls, Telemarketers and Unwanted Calls Using CallerID. The only Smart Call Blocker for Landline Phones and Home Phones
  • BLOCKS ALL UNWANTED CALLS: Have you been getting "Spam Likely" Calls? Political Calls, Telemarketers, Scammers - you name it, they're on our list. With Call Control Home, you can ensure the Block List will remain updated with CommunityIQ blocking millions robocalls based upon user-generated insights. *MUST HAVE CALLER ID & SMARTPHONE FOR PRODUCT TO WORK.*
  • NO ONGOING FEES: Simply connect Call Control Home to your landline telephone, download the app to your smartphone (iPhone & Android) and start blocking right away! There are no ongoing fees beyond purchase, however, if you'd like to block spam calls on your smartphone as well, you can upgrade to our premium Call Control mobile app. This decision does not affect landline call blocking in any way.
  • THE ONLY AUTOMATED CALL BLOCKER: No need to tap a button to block calls after they come through, Call Control Home automatically blocks them BEFORE they even connect! The only “Smart” Call Blocker for Landlines and Home Phones can automatically block calls and right out of the box. Block telemarketing calls, robocalls, spam calls, "spam likely" calls and more with no manual work required! Mobile app supports phones iPhone 5S or newer and Android 6+ or newer.
  • FREE WARRANTY & GUARANTEED SATISFACTION: Enjoy a Free '30 Day Customer Satisfaction Guarantee', that allows you to return your unit for a full refund within 30 days if you're unhappy with it at all! Also, we provide a Free '1 Year Product Warranty', that allows you to return your unit if you have any product defects within 1 year of purchase. Please be sure to read installation instructions carefully!
  • MANAGE REMOTELY: Call Control Home WIFI can be managed remotely either via our free iOS or Android apps or via our free online web portal. This means you can install Call Control Home at your parents home, your business or at your home and manage the call blocking settings, see the call history and block spam calls from anywhere!
Rank No. #4
wondcam Call Blocker for Landline Phones, Premium Phones with Call Blocking, One Touch Number Block Device, Block Unwanted Robocalls and Nuisance Calls
  • One Touch Ability to Stop Nuisance Calls: The call blocker is extremely easy to use. It is especially designed for senior citizens. Just hit red BLOCK button to stop all spam calls. Great choice for Christmas gift.
  • Block International Area Codes: The phone number blocker can block international area codes, it's useful for those international aggravating calls that deceptively adopt your area code and any exchange.
  • Eliminate Unsolicited Calls: The call block device has a 2000 number blocking capacity. Completely stop those pesky callers who drive you to insanity. It can block robot calls, telemarketing calls, private calls, scam calls, unknown calls, international call, sell and harass calls.
  • Protect Your Privacy: The phone call blocker is the greatest invention to enhance the privacy of your home phones. Say good bye to all annoying voice-mails.
  • Easy to Set Up: The BLOCK button is a lot of fun to use, when annoyance numbers call you, just press red button and say bye-bye, you will not get annoying calls constantly anymore.(Do not display caller name)
Rank No. #5
PENCHEN Call Blocker for Landline Phones Telephone 2000 Caller ID Box Blocking One Touch Number Block Device Block Unwanted Robocalls and Nunce Calls
  • The call block device has a 2000 number blocking ty. Completely keeping your phone quite without annoying call.
  • The phone number blocker can block international area codes, it's useful for those international aggravating calls that deceptively adopt your area code and any exchange.
  • One-touch blacklist function, sur easy to orate even without manual.
  • The phone call blocker is in to enhance the privacy of your home phones. Say goodbye to all annoying voice-mails.
  • With just 6 buttons on the blocker and clear LCD screen, friendly for older ople as well. A great choice for Christmas gift.
Rank No. #6
CPR V10000 – Whitelist Call Blocker. Landline Phone Call Blocker. Dual Mode Protection. Pre-Loaded with 10,000 Known Robocall Scam Numbers - Join Our Mission to Create a spam Free Community
  • Pre-loaded Nuisance Robocall Database: The CPR V10000 comes pre-loaded with a database of known nuisance robocall numbers. This feature, not commonly found in competitors' products, provides immediate relief from unwanted calls plus you have the ability to block a further 2,000 unwanted numbers at your discretion.
  • Whitelist Feature: Unlike many other call blockers, the CPR V10000 offers a whitelist feature. This allows you to prioritize calls from specific numbers, ensuring that you never miss an important call from loved ones or business contacts.
  • Easy Installation & Compatibility: The Call Blocker is designed for easy setup, making it user-friendly even for those who are not tech-savvy. Many competing products require complex installation processes. Compatible with all landline phone systems, including VOIP, making it a more versatile choice compared to other call blockers in the market.
  • Quality and Customer Support: CPR offers excellent customer support, ensuring that any issues or queries you have about the product are addressed promptly and effectively. This level of customer service sets it apart from many competitors. CPR is known for its high-quality build and durability, ensuring that it will last longer and perform better than many other call blockers on the market. Don’t let another unwanted call interrupt your day.
  • CALLER ID SERVICE IS REQUIRED FROM YOUR NETWORK PROVIDER FOR THIS PRODUCT TO WORK.
Rank No. #7
CPR V2000 Call Blocker for Landline Phones | Answering Machine | Home Cordless Phones | Works with All Analog Telephones | Caller ID Service is Required (White)
  • Are you tired of being bombarded by pesky telemarketers and unwanted calls interrupting your daily routine? Are you tired of having to waste your time answering calls that you don't even want? If so, then the V2000 call blocker with the big red button is the perfect solution for you!
  • Imagine having the power to instantly block any unwanted calls with just the press of a button. No more wasting your time answering calls from telemarketers or scammers trying to sell you things you don't want or need. With the V2000 call blocker, you have complete control over who can reach you on the phone
  • But how does it work, you ask? Well, it's simple. The V2000 call blocker uses advanced technology to screen incoming calls and identify those that are unwanted. With its large red button, it's easy to block calls as they come in, giving you peace of mind and freedom from unwanted interruptions.
  • But don't just take my word for it. The V2000 call blocker has been praised by countless customers for its ease of use and effectiveness. It's a simple and reliable solution that will save you time and frustration in the long run.
  • In conclusion, the V2000 call blocker with the big red button is the perfect tool for anyone looking to take control of their phone calls and reduce unwanted interruptions. So why wait? Order yours today and enjoy the freedom that comes with having the power to block unwanted calls with just the press of a button.
Rank No. #8
PENCHEN CT-CID803 Plus Caller ID Box Call Blocker Stop Nuisance Calls Devices Call ID LCD Screen Display with 1500 Numbers Capacity Stoping All Cold Calls for Fixed Phones Antique Landline Telephone
  • Block unwanted callers.
  • FSK/DTMF dual system.
  • 1500 numbers memories for blacklist.
  • Reviewing and deleting of numbers in blacklist.
  • Blcklists & whitelists of switchable.
Rank No. #9
Call Blocker for Landline Phones, One Touch Number Block Device, Block Unwanted Robocalls and Nuisance Calls, 2000 Groups Blacklists
  • 2000 GROUPS BLACKLIST: Caller ID box has 2000 groups of large capacity blacklist storage, blocking all nuisance calls.
  • ANTI HARASSMENT: Call blocker can block nuisance calls, super filtering anti harassment, guarding private pure space.
  • EASY TO USE: Phone blocker is easy to use, just press the block button to block incoming calls permanently.
  • PLUG AND PLAY: Call blocking device is designed with dual plugs, plug and play, suitable for most landline phones.
  • LCD SCREEN DISPLAY: Call blocker uses LCD screen display for easy operation and simple buttons for easy operation.
SaleRank No. #10
Ultimate Call Blocker WiFi - Block Virtually All Unsolicited Calls (Robocalls, Scams, Non-Profit, Unwanted) Without Having to Touch A Button! New Cloud-Based, WiFi Technology. Made in USA.
  • GLOBAL BLACKLIST - This list has 450,000+ phone numbers linked of unsolicited calling. The UBlocker WL searches this list to AUTOMATICALLY block scam calls, robocalls, political calls, telemarketing calls, and many other unsolicited calls WITHOUT HAVING TO PUSH A BUTTON OR TALK TO ANYONE! These calls are disconnected after 1 ring. NOTE: The Global BLACKLIST is a service operated & maintained by HQTelecom, and it is included with your purchase for 12 months.
  • USER BLACKLIST - The UBlocker allow users to block UNLIMITED phone numbers, names, and area codes / prefixes via the web. Users can manage their lists of allowed numbers (Whitelist), blocked numbers (Blacklist) calls, and new numbers (recent incoming calls) using a web-based interface with 24x7 access from any PC, laptop, tablet or smartphone.
  • NAME BLOCKING - In addition to number and area codes, the UBlocker also has the ability to BLOCK calls using NAMES including OUT OF AREA, UNKNOWN, PRIVATE, and any other name (or partial names) that shows in the Caller ID of your existing phone handset.
  • WHITELIST MODE (ON/OFF) - Another new feature (only available in the UBlocker) is the WHITELIST MODE (ON/OFF) – When turned ON, it blocks all calls except those in your WHITELIST. This option will give you TOTAL PRIVACY!
  • Compatible with ALL phone service providers in the US (including traditional PSTN, POTs, Cooper landlines, Cable (or Coax) lines, and VoIP. IMPORTANT: CALLER ID SERVICE MOST BE ACTIVE ON YOUR PHONE LINE FOR THIS PRODUCT TO WORK. One device protects ALL extensions or handsets on a phone line or number.
Rank No. #11
Call Blocker for Landline Phones,Premium Phones with Call Blocking with Dual System of FSK and DTMF,One Touch Number Block Device Such as robocalls and Political Calls.
  • The product is to block the unwanted calls such as robocalls and political calls.
  • Dual system of FSK and DTMF. Large capacity of 1500 phone number memory blacklist.
  • Switchable blacklist and whitelist, convenient to use and easy to operate.
  • You can press the last/next button to check the incoming and outgoing calls.
  • High quality guaranteed, stable performance, you can use it with confidence.
SaleRank No. #12
AT&T CL82207 DECT 6.0 2-Handset Cordless Phone for Home with Answering Machine, Call Blocking, Caller ID Announcer, Intercom and Unsurpassed Range, Silver
  • LONG RANGE & ANSWERING SYSTEM Experience the best in long-range coverage and clarity, provided by a unique antenna design and advances in noise-filtering technology. This reliable cordless system includes a digital answering machine that can record up to 22 minutes of incoming messages, outgoing announcements and memos, and a voice-guide for easier set up.
  • SMART CALL BLOCKER & CALLER ID ANNOUNCE Say goodbye to unwanted calls. Robocalls on your landline are automatically blocked from ever ringing through - even the first time. You can also permanently blacklist any number you want with one touch on the delicated key on the handset. The call block directory can store up to 1,000 name and number entries. Plus, the handset announces the name of the caller, so you can decide on answer the call or block it - screening call is never easier.
  • LARGE 2-INCH SCREEN, BIG TEXT, LIGHTED KEY PAD High-contrast text on the extra-large 2 inch screen makes it easy to read incoming caller ID or call history records. Plus, the enlarged font and extra-large and lighted handset keypad allows for easy dialing in low-light conditions. This feature is especially helpful for those who are visually impaired.
  • HANDSET SPEAKERPHONE & INTERCOM This cordless system has built-in a simulated full-duplex speakerphone on handset allowing both ends to speak - and be heard - at the same time for conversations that are more true to life. Also designed with useful features like handset intercom to help your daily communications enjoyable.
  • EXPANDABLE TO 12 HANDSET Easily add accessory handsets (use CL80107 or CL80067 models) up to 12 total, with just one phone jack.
Rank No. #13
AT&T BL102-4 DECT 6.0 4-Handset Cordless Phone for Home with Answering Machine, Call Blocking, Caller ID Announcer, Audio Assist, Intercom, and Unsurpassed Range, Silver/Black
  • UNSURPASSED RANGE & ANSWERING SYSTEM Experience the best in long-range coverage and clarity, provided by a unique antenna design and advances in noise-filtering technology. This reliable cordless system includes a digital answering machine that can record up to 22 minutes of incoming messages, outgoing announcements and memos, and a voice-guide for easier set up..Rechargeable batteries: This product contains nickel-metal hydride rechargeable batteries
  • SMART CALL BLOCKER & CALLER ID ANNOUNCE Say goodbye to unwanted calls. Robocalls on your landline are automatically blocked from ever ringing through - even the first time. You can also permanently blacklist any number you want with one touch on the delicated key on the handset. The call block directory can store up to 1,000 name and number entries. Plus, the handset announces the name of the caller, so you can decide on answer the call or block it - screening call is never easier.
  • LARGE 2-INCH SCREEN, BIG TEXT, LIGHTED KEY PAD High-contrast text on the extra-large 2 inch screen makes it easy to read incoming caller ID or call history records. Plus, the enlarged font and extra-large and lighted handset keypad allows for easy dialing in low-light conditions. This feature is especially helpful for those who are visually impaired.
  • HANDSET SPEAKERPHONE, AUDIO ASSIST, INTERCOM This cordless system has built-in a full-duplex speakerphone on handset allowing both ends to speak - and be heard - at the same time for conversations that are more true to life. Also designed with useful features like Audio Assit, handset intercom to help your daily communications enjoyable.
SaleRank No. #14
Ooma Telo VoIP Free Internet Home Phone Service. Affordable landline replacement. Unlimited nationwide calling. Call on the go with free mobile app. Low international rates. Can block robocalls, black
  • Crystal-clear nationwide calling for free and low International rates. Pay only monthly applicable taxes and fees.
  • # 1 rated home phone service for overall satisfaction and value by a leading consumer research publication.
  • Pure Voice HD delivers superior voice quality for a consistently great calling experience.
  • Includes nationwide calling, voicemail, caller-ID, call-waiting, 911 calling and text alerts.
  • More features including the ability to block robocallers available when you upgrade to Ooma Premier phone service.
Rank No. #15
Call Blocker
  • Block All calls : Filters all calls when don’t want to accept any call
  • Block not saved Contacts : Unknown person will be blocked
  • Junk Call Blacklist : Block the Call Which you have added in your Blacklist
  • Cancel : Disables all call blocks.
  • Call Manager : Add/remove numbers to black list. Keep privacy safe.
Rank No. #16
FEABASK USB Headset with Microphone for PC Laptop - Wired Computer Headphones with Noise Cancelling Microphone for Home Office Online Class Skype Zoom Meetings,in Line Mute Controls
  • ✅【Ultra light and Soft USB Headset】: USB computer headset is lightweight, featuring soft ear cups and an adjustable headband to fit all sizes. Memory foam ear cups rest gently on your ears, while the ergonomic design ensures a comfortable and secure fit without discomfort. Perfect for extended wear, it reduces pressure on the ears and blocks external noise.(Connecting to a PC requires the use of a USB port,so that microphone to function)
  • ✅【Noise-Canceling USB Headphones for Clear Calls】: With voice pickup technology and advanced audio signal processing, the microphone of wired USB headset is calibrated for optimal performance.USB headset picks up your voice clearly in busy office environments, ensuring high-quality virtual meetings. Ideal for online meetings, e-learning, office business, conference calls, Skype chats, call centers, webinar presentations, Rosetta Stone, Dragon Speaking, Remote working and more.
  • ✅【Crisp Audio USB Headphones with Microphone for Meetings】: The 40 mm dynamic drivers produce high-resolution sound and deliver clear, 100% authentic audio. Real-time audio calibration ensures an outstanding listening experience for clearer online meetings and increased work-from-home efficiency.
  • ✅【3.5MM & USB Computer Headphones: Plug and Play】: The computer headset with mic mute & indicators/speaker mute is compatible with 3.5mm jack or USB devices: PC, tablet, Mac, iOS, laptop, Android phone. The cable (about 5+4 feet) with in-line audio volume control allows the freedom to stand and stretch during long conversations. Work and talk anytime, anywhere!
  • ✅【Warranty Guarantee & Valued Service】: We're dedicated to providing you with high-quality wired headsets at an affordable price. We promise a hassle-free refund or replacement for any defects. Enjoy peace of mind with our commitment to your satisfaction.
Rank No. #17
Digital Devices & Eyesight: Understanding the effects of computer screens, smart phones, tablets and similar devices on your vision
  • Amazon Kindle Edition
  • Brand, HealthRyt (Author)
  • English (Publication Language)
  • 43 Pages - 04/10/2020 (Publication Date)
Rank No. #18
The Easy and Relaxing Memory Activity Book for Adults: Includes Relaxing Memory Activities, Easy Puzzles, Brain Games and More
  • Kinnest, J. D. (Author)
  • English (Publication Language)
  • 152 Pages - 02/14/2020 (Publication Date) - Lomic Books (Publisher)
Rank No. #19
Customer Service Quality - How to Excel
  • Amazon Prime Video (Video on Demand)
  • --- (Director) - Alan Chriest (Producer)
  • English (Playback Language)
  • English (Subtitle)
Rank No. #20
Ooma Telo VoIP Free Internet Home Phone Service with 3 HD3 Handsets. Affordable landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option to Block robocalls.
  • Crystal-clear nationwide calling for free and low international rates. Pay only monthly applicable taxes and fees.
  • Includes three Ooma HD3 Handsets with 2" color screen
  • #1 rated home phone service for overall satisfaction and value by a leading consumer research publication.
  • PureVoice HD delivers superior voice quality for a consistently great calling experience.
  • Includes unlimited nationwide calling, voicemail caller-ID, call-waiting, and 911 calling with text alerts.

Last update on 2023-08-07 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best Telephone Call Blocker Devices?

Do you get stressed out thinking about shopping for a great Telephone Call Blocker Devices? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Telephone Call Blocker Devices, which is why we have assembled a comprehensive list of the greatest Telephone Call Blocker Devices available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Telephone Call Blocker Devices that you consider buying. Your questions might include the following:

  • Is it worth buying an Telephone Call Blocker Devices?
  • What benefits are there with buying an Telephone Call Blocker Devices?
  • What factors deserve consideration when shopping for an effective Telephone Call Blocker Devices?
  • Why is it crucial to invest in any Telephone Call Blocker Devices, much less the best one?
  • Which Telephone Call Blocker Devices are good in the current market?
  • Where can you find information like this about Telephone Call Blocker Devices?

We’re convinced that you likely have far more questions than just these regarding Telephone Call Blocker Devices, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Telephone Call Blocker Devices, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Telephone Call Blocker Devices. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Telephone Call Blocker Devices buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Telephone Call Blocker Devices currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Telephone Call Blocker Devices has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Telephone Call Blocker Devices?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Telephone Call Blocker Devices.
  5. Customer Ratings: Number ratings grade Telephone Call Blocker Devices objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Telephone Call Blocker Devices.
  7. Product Quality: You don’t always get what you pay for with an Telephone Call Blocker Devices, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Telephone Call Blocker Devices is should be an indication of how long it will work out for you.

We always remember that maintaining Telephone Call Blocker Devices information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Telephone Call Blocker Devices is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

FAQ:

Q: How do you block calls on a cell phone?

A: Go to “Phone” or “Phone Settings” and select “Calls” or “Incoming Calls.”. Press “Blocked Callers,” “Blacklist,” “Unwanted Calls,” or another similarly named option menu. Your contact list or phone book will appear; choose the name you wish to block, or manually enter the phone number you wish to block.

Q: How do you block a cell phone?

A: For blocking your cell phone number temporarily, press *67 followed by the phone number you wish to dial. For example, if you wish to call (123) 456-7890, then to block your cell phone number, press *671234567890 to complete your call and also to block your cell phone number.

Q: How can I block a cell phone signal?

A: Fortunately there is a solution: You can use a cell phone jammer to block their signals. Cell Phone Jammers . Buy a cell phone signal jamming device from eBay, Amazon or any online spy and gadget site. These devices will block signals anywhere from 10 to 200 feet, depending on the model that you decide to purchase.

Q: Do call blocking devices work?

A: Yes, The CPR Call Blocker will work on all standard domestic telephone lines from the main US telephone providers. How much power does the CPR Call Blocker use? The CPR Call Blocker uses very little power from your telephone line. If you have copper line service, the power comes from your service provider.

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