SpamBuster screens every incoming call against rules you control — entirely on your device. Your calls and numbers never leave your phone.
Download on Google PlayFree · Android 10+ · No internet permission
Six reasons people switch.
SpamBuster has no internet access at all. Your calls, numbers, and contacts never leave your phone. Nothing is uploaded, tracked, or sold.
Every filter is opt-in and tunable. SpamBuster does exactly what you tell it to, nothing more.
Reject unwanted calls silently, or let them ring with a "Suspected spam" warning so you can decide. Your choice, per rule.
A full call history shows every blocked, flagged, and allowed call — with the reason it was matched. No surprises.
Once set up, it works in the background. Your phone only rings for calls that pass your rules.
A single-purpose tool, not a bloated "security suite." It does one thing, and does it well.
Three outcomes. Zero complexity.
When a call comes in, SpamBuster checks it against your active rules in a fraction of a second and picks one of three outcomes:
| Outcome | What the caller experiences | What you experience |
|---|---|---|
| Allowed | Call rings normally | Your phone rings as usual |
| Soft-flagged | Call still rings through | Phone rings + a "Suspected spam" notification |
| Hard-blocked | Silently rejected — they hear voicemail or a busy tone | Phone stays silent; call is logged |
Good for filters you're not 100% sure about (e.g. unknown callers), so you never miss a real call.
Good for filters you trust completely (e.g. known spam prefixes, your personal blacklist).
All the tools, none of the bloat.
Add specific numbers you never want to hear from. The blacklist always hard-blocks and takes priority over every other rule — a blacklisted number is rejected, full stop. You can add a number straight from your call history.
Phone regulators reserve certain number ranges for telemarketing. Legitimate callers never use these ranges, so they're safe to block outright. SpamBuster ships with curated, built-in spam prefixes — including ranges reserved by France's ARCEP for telephone canvassing. Toggle by country or by individual prefix. Defaults to hard-block.
Block callers who hide their caller ID. When this filter is on, calls with no visible number are hard-blocked.
Block or flag calls from any number that isn't saved in your contacts. Calls from people you know are never blocked by this filter. Only active if you grant contacts access — SpamBuster skips it gracefully otherwise.
Block or flag calls coming from outside your home country. Your home country is always allowed. Add per-country exceptions for specific foreign countries you do expect calls from, or set individual countries to their own soft/hard treatment.
A complete, on-device log of every screened call: the number, the caller's name if they're a contact, the time, the outcome, and the rule that triggered it. Tap an entry to add the number to your blacklist. Configurable retention: 1 day, 7 days (default), 30 days, 90 days, 1 year, or forever.
Because Android gives screening apps no in-call label, soft-flagged calls trigger a heads-up notification so you can recognise a likely spam call while it's still ringing.
SpamBuster cannot send data off your device, by design.
Your calls, contacts, and blacklist are stored only on your phone. There is literally no network access in the app.
SpamBuster guides you through a short setup — takes under a minute.
SpamBuster explains what it does and makes its privacy promise: your data stays on your device, always.
Grant phone access (required). Contacts and notifications are optional — SpamBuster works without them.
Choose SpamBuster as Android's call screener. Android will prompt you directly.
Tell SpamBuster your home country so it can distinguish local from foreign numbers.
Flip on the filters you want and pick soft or hard for each one.
A summary of what's now protecting you. Everything chosen during setup can be changed anytime in Rules and Settings.
Requires Android 10 (API 29) or newer.
Common questions, straight answers.