Last updated: July 2026
PrefixBlocker does not collect, store or transmit any personal data to any server operated by us or anyone else. There is no account and no cloud: the app runs entirely on your phone. We do not gather phone numbers, contacts or call history.
To block calls, PrefixBlocker uses Android's call screening role, which lets the app decide on incoming calls on your device. This processing happens locally and no call information is sent anywhere.
Access to your contacts is optional. If you choose to block specific contacts or groups, the app reads your contacts only on the device to match incoming calls. Your contacts are never uploaded or shared.
PrefixBlocker does not need an internet connection to block calls; it works fully offline. In normal use the app sends no network requests carrying personal data:
This website (www.prefixblocker.com) uses Google Analytics 4, a service provided by Google, to collect anonymous and aggregated statistics about visits, such as pages viewed, approximate location (country level) and device type. This helps us understand how the site is used and improve it.
Analytics cookies are only set after you accept them through the cookie banner. Until you make a choice, Google Consent Mode keeps analytics storage disabled. You can change or withdraw your consent at any time via the "Cookie settings" link in the footer.
Google processes this data on our behalf as a data processor. We do not use advertising cookies and we do not sell or share your data for advertising. For details on how Google handles data, see Google's Privacy Policy.
Important: this analytics applies only to the website. The PrefixBlocker Android app itself contains no analytics, tracking or telemetry.
The one-time unlock is purchased through Google Play billing. Payments are handled entirely by Google; we do not receive or store your payment details. Please refer to Google Play's privacy policy for how they handle purchase data.
If you have questions about this privacy policy, you can reach us through the PrefixBlocker support channel on Google Play.
