# KnownCalls - Whitelist calls

> Unknown calls blocker with a whitelist. No ads. No-Internet private and easy!

Canonical page: [https://chrome-stats.com/d/com.felenasoft.callblocker](https://chrome-stats.com/d/com.felenasoft.callblocker)

## Overview

- **ID:** `com.felenasoft.callblocker`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Felenasoft Ltd.
- **Category:** COMMUNICATION
- **Downloads:** 184,387
- **Rating:** 4.49 / 5 (1,871 ratings)
- **Version:** 26.08.07
- **Last updated:** 2026-08-07
- **First published:** 2022-07-28
- **Publisher country:** RU
- **Size:** 13 MB
- **Data as of:** 2026-09-11
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.felenasoft.callblocker)
- **Website:** [https://felenasoft.com/knowncalls/](https://felenasoft.com/knowncalls/)
- **Privacy policy:** [https://felenasoft.com/knowncalls/en/privacy/](https://felenasoft.com/knowncalls/en/privacy/)

## Description

**KnownCalls** is a free and ad-free Android call blocker that instantly rejects all calls from unknown numbers not in your contacts. Designed to protect your privacy, it operates without requiring an internet connection, using only your device's phone book to filter calls. This ensures your personal data remains secure while filtering out telemarketers, robocalls, scammers, and unknown callers, helping you avoid unwanted interruptions.

The app is extremely user-friendly with a simple one-click enable/disable option and supports internal pass and block lists for numbers you interact with after installation. Ideal for parents, business professionals, seniors, and anyone looking to reduce spam call disruptions, KnownCalls offers an effective, no-hassle solution without any hidden costs or advertisements. Get tranquility without missing trusted callers by using KnownCalls – a private, instant, and reliable call blocking app.

## Rankings

- #165,626 — Overall

## Permissions and access

### Permissions

- `android.permission.READ_CONTACTS`

## Review summary

KnownCalls is highly praised for its core ability to block non-contacts, dramatically reducing spam and telemarketing. Users cite a simple, lightweight UI and free usage, which together restore peace of mind by allowing through only known contacts. However, reviews note occasional blocking gaps, lack of SMS blocking, occasional crashes, and some privacy concerns. Overall, it’s a strong, user-friendly call-blocking tool at no cost, with room for improvements such as SMS support, stability, and clearer privacy practices.

### Pros

- Blocks calls from numbers not in your contacts, effectively stopping most spam and telemarketing.
- Simple, intuitive interface with little to no bloat; easy to set up and use.
- Free to use with no subscription or paid features required; widely praised for cost.
- Reduces interruptions and improves peace of mind by keeping only known contacts through.

### Cons

- Some spam calls still slip through occasionally; not 100% reliable.
- Does not block SMS/text messages; lacks text blocking as a feature.
- Occasional crashes or instability reported by some users.
- Privacy concerns and perceived data collection by the app; some users question its free status.

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.felenasoft.callblocker)