Knowho — Know Who's Calling

Caller ID by your trusted list

Only for iPhone

Free · In‑App Purchases

iPhone

Spam blockers only catch known numbers. Knowho flips the approach — only numbers YOU trust get identified. Unknown number? Stay alert. Your whitelist, your rules. Knowho is a caller ID app built around your personal whitelist — not a spam database. Spam block Apps known spam numbers. But voice phishing numbers change daily. Unknown numbers slip right through. Knowho flips the approach. • You register only the numbers you trust. Everything else? Stay alert. • No matter how many times scammers change their number — they can't fool a whitelist. Features • Import numbers from Notes, SMS, messenger apps — anywhere with a share button • Completely separate from iOS Contacts • Registered names shown automatically on incoming calls • Fully offline · No data collection — Your contacts stay on your device and are never sent to any server

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, Jae Hee SHIM, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    • Seller
      • Jae Hee SHIM
    • Size
      • 1.3 MB
    • Category
      • Utilities
    • Compatibility
      Requires iOS 17.0 or later.
      • iPhone
        Requires iOS 17.0 or later.
    • Languages
      English and 2 more
      • English, Japanese, Korean
    • Age Rating
      4+
    • Copyright
      • ©2026 Quite.0.lab