Unknown calls blocker with a whitelist. No ads. No-Internet private and easy!
KnownCalls is a privacy-first, ad-free call blocker that automatically rejects unknown numbers using only your device's contacts. It requires no Internet connection and offers a simple on/off blocking with a trusted whitelist to keep important callers through. With 100,000+ total downloads and 4.4K in the last 30 days, KnownCalls demonstrates steady demand for a lightweight, private way to stop robocalls.
Pros & Cons
Ad-free experience with no ads
Offline operation—no Internet required for blocking
Instant blocking of unknown numbers using your Contacts
Whitelist-based protection to ensure trusted callers go through
Only handles phone calls (SMS blocking requires a separate KnownCalls for SMS muting from the official site)
About KnownCalls - Whitelist calls
KnownCalls - Whitelist calls is a communication app developed by Felenasoft Ltd..
Download Statistics
KnownCalls - Whitelist calls has been downloaded 170 thousand times. In the last 30 days, the app was downloaded 4.4 thousand times.
User Ratings
KnownCalls - Whitelist calls is rated 4.60 out of 5 stars. The rating is based on 1.7 thousand ratings.
App Information
KnownCalls - Whitelist calls is FREE to download. The last update was on March 24, 2024.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play March 2024.
Description
KnownCalls is the new ad-free and absolutely free call blocker app for Android that helps fight spam calls while respecting your privacy.
!This app only works with calls. For work with text messages, download the KnownCalls' version with SMS muting from its official website.!
With KnownCalls your phone will automatically reject calls from numbers not in your Phone book. It will save you time wasted on answering spam calls, and make you an uninteresting target for fraudsters.
This simple app works against telemarketers, anonymous or hidden numbers, robocalls, spam or other unknown calls, and various kinds of scammers.
! The app is for those who don't want to (or need to) answer calls from any unknown numbers.
!! This is a free app that DOESN'T provide tech support. Please use our online resources and community to get answers to your questions. However, you can mail us your ideas of improvement.
==NO INTERNET CONNECTION REQUIRED== The app doesn’t use external resources. It works solely with your device’s Phone book so your privacy is safe! Perfect for those who care about their digital imprint.
==WHY KNOWNCALLS IS BETTER== 1. Spammers usually call from different numbers each time, so adding each number to a block list might prove ineffective – next time they might just use another number. But KnownCalls blocks all unknown call numbers so it's not a problem any more.
2. Rejection of unknown callers is instantaneous because KnownCalls uses your device’s Phonebook only. Other call blocker apps usually work with a delay so you might be among earliest recipients that spam calls still get through to before being flagged as spammers.
3. 100% free. No hidden payments.
4. Absolutely no ads.
5. Extremely easy to use. 1 option to enable/disable blocking.
6. KnownCalls does not collect or send personal data or information on your phone calls anywhere - unlike other apps that use spam databases in the Internet and send your calls there too.
7. Installs well on almost any contemporary Android device.
8. Has additional internal pass and block lists (only for numbers that you interacted with after you had started to use KnownCalls).
STOP annoying robocalls or buzzing from call centers, telemarketers and fraudsters that always distract you when you're busy, wake you up in the middle of the night, or intend to scam you. Finally you can enjoy the silence – and be sure that trusted callers still get through!
Recommend KnownCalls to your family and friends – let them feel the tranquility of life without spam too!
==HOW IT WORKS== * Download KnownCalls call blocker app from Google Play or our website and install it on your device. * Turn on filtering with 1 click. * Done! All unknown calls from numbers that are not in your Contacts or Favorites will be automatically rejected without bothering you.
==SPAM PROTECTION FOR EVERYONE== The KnownCalls app is a perfect call blocker for
* Parental control: protect your kids by creating a whitelist of trusted numbers, and block calls from any other phone numbers. * Public people: stop the flow of distracting phone calls while keeping accessibility for known callers. * Businessmen: let KnownCalls automatically filter out spam call center buzzes, while still allowing calls from your Contacts. * Senior protection: make sure scammers don’t take advantage of your elderly by blocking calls from any unknown numbers.
==RECAP OF KNOWNCALLS== The KnownCalls app is the unique combination of privacy protection, easy functionality and availability. It is free of charge. No Internet accessibility required! KnownCalls does not gather, store, send or share your personal information.
Use KnownCalls call blocker if you are worried about scammers that could fraud your seniors or children: block all unknown calls!
Accumulated effect: Even if you are assaulted with spam calls now, using KnownCalls will make you an uninteresting target for call centers over time.
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Comments on KnownCalls - Whitelist calls for Android
★★★★★Don Tobias· Jun 6, 2026
I really like the way this app works!!! I subscribed because of a scam call that keeps bothering me DAILY. And they have a large list of telephone numbers! I think "Known Calls" may have removed 4 of their numbers, but I have to verify this. If true, I will write back. The name they use is "Potential Spam", and I don't know what their game is, but it can't be good!! Thank you, Don
★★★★★Robin Searcy· Apr 2, 2026
This app is awesome. Perfect way to handle unwanted calls, and it does it perfectly
★★★★★Sean Masters· Dec 16, 2025
This app works great for blocking any calls not in your contacts.
★☆☆☆☆Cathey Lynn D· May 13, 2026
Not working. I just received a call from Indiana not in my contacts, and it didn't block it
★★☆☆☆rancid crawfish· May 22, 2026
Looks like it could work. But there's ZERO information on this app. It doesn't show any options to create a white list OR a black list. But there are options to block people on the black list and only allow calls from the white list. It even lets you know your white list is empty. But there's no way to make the god-damn list. And if there is, it isn't obvious or easy.
★☆☆☆☆Chris Jarvis· Nov 28, 2025
Sadly this app is of no use to use safely. Blocks people in your contacts if the number doesn't come through in exactly the same format (e.g. +44 at the start). My daughter was unable to call me while I had the app installed. Sadly can't rely on it, so had to uninstall.
★☆☆☆☆Prashant Gangwani· Nov 25, 2025
There is no option which rejects calls with SMS. SMS sends from SMS templates
Google Play Rankings for KnownCalls - Whitelist calls
This app is not ranked
Technologies used by KnownCalls - Whitelist calls
Trust & Safety: Privacy-focused call blocker that relies on the device’s Contacts and Favorites. It operates without Internet access and does not collect or transmit personal call data.
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