Call Defender

    Call Defender icon

    Call Defender

    by: 85.7K 9

    9 Users



    Notice: About Foreground Service Alert

    According to Google’s Android Oreo policy, we are obligated to show the service status in the notification channel when the service is running in the background. You can go to settings to hide the alert and keep the service working.

    If your device is Android 8.0/8.1 system, after you switch off the foreground service alert, you will still see Android system alert. If you are Android 7 or below users, this policy will not affect you.

    How do I turn this off? Please check here

    Call Defender (a.k.a. Studio Kuma Call Filter ) is a FREE spam call blocking app that has protected millions of users against annoying spam calls.

    “SPAM CALL BLOCKING”: Just turn on "Spam Database" and enjoy a life free of spam, no additional charges needed! The database is provided by HKJunkCall.

    “CALLER IDENTIFICATION”: Enjoy real-time caller identification! Call Defender shows the name of public or private organizations when they are calling you. Call Defender can identify over 500 thousand HK phone numbers which include hospitals, educational institutions and so on. You may want to pick up a call from the hospital even if you are in the middle of a important meeting, right? The data comes from HKJunkCall Whitelist, community, Internet, websites and number owners. We DONT upload the contact books of users.

    “REALTIME DATABASE”: The system checks the database every 10 minutes, and updates to the device when there is a new spam number, effectively eliminating all spam calls that frequently harass people. This feature is free if the “Charging Assistant Screen” is enabled.

    Call Defender provides the simplest way to block unwanted calls and protect your privacy with ease. Call defender also lets you know who is calling using our comprehensive global database with over 700 million numbers.

    New Feature! - The new blocking mechanism, "Set as default phone app", allows the blocking action to be truly silent, with no vibration and no prompts on smartwatches.
    New Feature! - The Call Defender Information Center provides you with tips, anti-fraud and consumer education messages.

    Block unwanted spam calls automatically
    The new blocking mechanism, "Set as default phone app", allows the blocking action to be truly silent, with no vibration and no prompts on smartwatches.
    Use Caller ID to find out who is calling from unknown phone numbers
    Advanced settings for advanced users
    Search spam number database
    Get Daily Call Report for any blocked/missed calls
    Do not be disturbed by any calls using Quiet Mode

    If you have any questions, please feel free to contact us via [Menu > About > Contact us] or mail (

    • To make sure Call Defender works properly, please load the app at least once after installation.
    • The point-rewards system will be deprecated.
    • If you are using optimization software, make sure to put Call Defender as a trusted app.
    • Network connection is required for database download or caller ID feature
    • Devices using unofficial Android framework may have compatibility issues.

    Tags: studiokuma call filter , 小熊來電 , 小熊來電通知 , 小態來電通知 , 小態來電 , studiokuma , studiokumacallfilter , phone filter , 小熊來電通知 設定

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