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Phone (cz.mts)

Phone app (calling, blocking, contacts) that you’ll love !
Are you looking for a safe, simple, and reliable calling app that won't bother you with ads or collect your data? 📱✨
You’ve just found it.

Why you’ll love this app: ❤️

🎨 Customizable colors:
Set the colors exactly to your liking.

💸 100% free:
No fees, no limits—all features are available.

🔒 Maximum privacy:
- The app collects no data about you.
- It allows you to save contacts to its own hidden storage, invisible to all other apps.

📡 No internet connection is required:
Internet permission is not declared, the application runs offline, nothing is sent or downloaded anywhere !

🚫 Ad-free:
No pop-ups, no annoyances.

🧭 Simple controls:
Logical and intuitive—anyone can use it. You can even search for contacts directly via the dialer using T9.

👨‍👩‍👧 No more unwanted calls:
Check a single box to allow calls only from your saved contacts (blocking spam, scams, and annoying call centers). Perfect for 👶 children and 👵 seniors.

💻 Open-source (GNU/GPL v3):
You can download the code from my website (https://mts.speccy.cz/mtsphone.htm) or github (https://github.com/martintobola-cz/czmtsphone) and review it at any time.

The app's story 🛠️

The original app was created by Slovak developer Tibor Kaputa (Simple Mobile Tools). Unfortunately, he sold it, and the new Israeli company immediately introduced an overpriced subscription model and ads. Naturally, this led to the creation of a new branch—first the Indian fork "Fossify," and subsequently this Czech 🇨🇿 fork of mine, which gets the app back on the right track and responds quickly to your feedback 💪



Help the app grow 🚀

I would appreciate any reviews or ideas for improvement. Just please 🙏 keep the core philosophy in mind: simplicity and functionality!

If you like the app and want to support its continued development, you can contribute any amount.
🪙 BTC: 14b8S8D98xBx4G5DCkt4XYsU3X4QQ7nivj
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 9.3.2 (932) suggested Added on Sep 26, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 9.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • access Do Not Disturb
      Allows the app to read and write Do Not Disturb configuration.
    • answer phone calls
      Allows the app to answer an incoming phone call.
    • directly call phone numbers
      Allows the app to call phone numbers without your intervention. This may result in unexpected charges or calls. Note that this doesn't allow the app to call emergency numbers. Malicious apps may cost you money by making calls without your confirmation.
    • android.permission.CALL_PRIVILEGED
    • run foreground service
      Allows the app to make use of foreground services.
    • route calls through the system
      Allows the app to route its calls through the system in order to improve the calling experience.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • show notifications
      Allows the app to show notifications
    • read basic telephony status and identity
      Allows the app to access the basic telephony features of the device.
    • read call log
      This app can read your call history.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • android.permission.READ_PRIVILEGED_PHONE_STATE
    • read sync settings
      Allows the app to read the sync settings for an account. For example, this can determine whether the People app is synced with an account.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • send and view SMS messages
      Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
    • This app can appear on top of other apps
      This app can appear on top of other apps or other parts of the screen. This may interfere with normal app usage and change the way that other apps appear.
    • display notifications as full screen activities on a locked device
      Allows the app to display notifications as full screen activities on a locked device
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • write call log
      Allows the app to modify your phone's call log, including data about incoming and outgoing calls. Malicious apps may use this to erase or modify your call log.
    • modify your contacts
      Allows the app to modify the data about your contacts stored on your phone. This permission allows apps to delete contact data.
    • android.telecom.action.CONFIGURE_PHONE_ACCOUNT

    Download APK 6.8 MiB PGP Signature | Build Log

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