PrefixBlocker

Siesta Soft S.L.

In-app purchases

About this app

PrefixBlocker stops unwanted and spam calls with rules you decide - by country prefix, wildcard patterns, saved contacts and groups. Privacy comes first: no account, no cloud, no data collection. Everything stays on your phone.

Ordinary call filters cannot block by prefix. PrefixBlocker can. Block an entire country code, a specific area, or patterns like +12 345* in a single tap.

WHY PREFIXBLOCKER
- Block by prefix: entire country codes or wildcard patterns that normal filters miss.
- Privacy by design: no numbers collected, no shared spam database, nothing to leak or sell.
- Your rules, not an algorithm: you decide who to block, not a list managed by someone else.
- Works offline: no connection needed to block a call.
- One-time unlock, no subscription.

FEATURES
- Prefix filter with two modes: Block list (block what you add) or Allow only (accept only what you add, block the rest).
- Country and wildcard blocking, guided by a built-in list of countries.
- Contacts and groups: block single contacts or whole groups. Contacts are optional and resolved locally - they never leave your phone.
- Group schedule: block a group only on the days and time ranges you choose.
- Anonymous and unknown calls: block calls with no number, independently.
- Transparent activity log: see every blocked call and the exact rule that caused it.
- Statistics: today, this month and all time, plus a 7-day chart and your most blocked prefixes.
- Optional system notifications for blocked calls.
- Light and dark theme, and an in-app language selector (English, Italian, Spanish, French).

HOW IT WORKS
1. Turn on the prefix filter and choose a mode.
2. Add the countries, prefixes or numbers you want to block or allow.
3. Optionally block specific contacts, groups and anonymous calls.
PrefixBlocker applies a clear, predictable order of precedence to every incoming call, so the behavior is always transparent.

PRIVACY
PrefixBlocker does not create an account, does not use any server, and does not collect or upload your phone numbers or contacts. If we do not collect anything, there is nothing to lose, sell or leak. No ads, no tracking.

PERMISSIONS
- Call screening role: required to decide whether to block an incoming call.
- Contacts (optional): requested only if you choose to block specific contacts or groups; used locally to identify callers.
- Notifications (optional): requested only if you turn on blocked-call notifications.
PrefixBlocker is not a dialer and does not read your call log or messages.

PRICING
Try it for free. A single one-time purchase unlocks the full app - no subscription, ever.

What’s new

Block unwanted calls by prefix, country and contacts. Full privacy: no account, no server, everything stays on your phone. Try it for free; a single payment unlocks unlimited blocking forever.