The privacy-first call blocker. No account, no cloud, no data collection. Everything stays on your phone.
PrefixBlocker stops nuisance and spam calls using rules you control: by country prefix, wildcards, contacts and groups. No shared spam database decides for you.
Free to try - one-time unlock, no subscription
Block whole country prefixes or wildcard patterns like +12 345*, something ordinary call filters simply can't do.
No data collection and no phone numbers gathered. With nothing collected, there is nothing to leak, sell or lose.
Block specific contacts or whole groups. Contacts are optional and resolved locally: they never leave your phone.
Independently block calls with no caller ID, so hidden and withheld numbers don't get through.
See every blocked call and the exact rule that caused it. Predictable behaviour, no surprises.
You decide what to block, not a shared list or an opaque algorithm. It works offline: no connection needed to block.
From install to a quieter phone in a couple of minutes.
Grant the call screening role so the app can decide on incoming calls. No other invasive permissions required.
Add the prefixes, wildcards, countries, contacts or groups you want to block. A live preview shows the effect before you save.
Unwanted calls are stopped on the spot. Open the activity log any time to see what was blocked and why.
Everything you need to know about PrefixBlocker.
PrefixBlocker is a privacy-first Android app that blocks unwanted and spam calls by country prefix, wildcard patterns, contacts and groups. Everything runs on your phone: no account, no cloud and no shared spam database.
No. PrefixBlocker does not collect or upload your number, your contacts or your call history. There is no server involved. Contacts are optional and, when used, are matched locally on the device only.
You can block whole ranges of numbers by how they start, for example an entire country code or a pattern like +12 345*. Ordinary call filters can only block single numbers, so prefix blocking is the main reason PrefixBlocker exists.
No. Blocking works completely offline. Since there is no server, PrefixBlocker can't lose data it never had.
You can try it for free up to the first blocked calls. After that a single low-cost, one-time unlock removes the limit. There is no subscription.
PrefixBlocker is an Android app (Android 10 and later). There is no iOS version and none is planned for now.
No. PrefixBlocker doesn't use a shared spam database decided by others. You are always in control of the rules, and every block is shown together with the rule that triggered it.
PrefixBlocker is coming soon to Google Play. Block spam calls with rules you control, right on your device.
Coming soon on Google PlayFree to try - one-time unlock, no subscription
