SpamBlocker
SpamBlocker is a free Android app for screening unwanted calls and SMS while leaving the phone’s default call and messaging apps in place.
What SpamBlocker is
SpamBlocker is a free Android app for screening unwanted calls and SMS while leaving the phone’s default call and messaging apps in place. For calls, it acts as a Caller ID app and does not need to keep running in the background after setup. Filters can use contacts and groups, STIR/SHAKEN information, repeated calls, emergency calls, meeting mode, and time-based rules. SMS tools block OTP floods, check spam databases, and learn from messages with a local AI filter. The app can download databases such as the FTC Do Not Call registry and query services including PhoneBlock. Numbers can be reported automatically or manually to crowd-sourced databases. SpamBlocker takes over SMS notifications, so notifications in the existing SMS app should be disabled to prevent duplicates. Its SMS log contains received messages, not sent ones. The project lists no automatic SMS clearing, RCS support, or Android 9 and earlier support. Offline features collect no data; online requests expose IP address, TLS/TCP fingerprints, and reported number to the API server. F-Droid lists version 5.18 for Android 10 or newer, under the MIT License.
Good
- Works without replacing default call or SMS apps
- Caller ID setup need not run in background
- Filters include contacts, STIR/SHAKEN, and time rules
- Local AI filter helps screen spam SMS
- Free MIT-licensed Android app
Watch out
- SMS log excludes sent messages
- No listed support for RCS
- No automatic SMS clearing plan
- Online features expose network and reported-number data
Who it suits
It suits Android users seeking call and SMS filtering without replacing their default apps. Android 10 or newer is required by the listed F-Droid version.
Verdict
SpamBlocker combines detailed call rules with SMS screening, database checks, and crowd reports. Check its Android version requirement, notification behavior, and online-data exposure before choosing it.
Plans and prices
From SpamBlocker's own pricing page, checked 11 Oct 2001.
| Plan | Price | What it gives you |
|---|---|---|
| SpamBlocker | Free | Android 10+ · MIT-licensed app |
The facts
Each one read from SpamBlocker's own pages, with the date it was checked.
What it does
- Call filters
- Call filters include contacts and contact groups, STIR/SHAKEN, repeated calls, emergency calls, meeting mode, and time-based rules.checked 11 Oct 2001
- Call handling
- For calls, the app works as a Caller ID app and does not need to keep running in the background after setup.checked 11 Oct 2001
- Distribution
- F-Droid lists version 5.18, added October 3, 2026, for Android 10 or newer and four Android CPU architectures.checked 11 Oct 2001
- Integrations
- The app can use downloadable spam databases such as the FTC Do Not Call registry and query online services such as PhoneBlock.checked 11 Oct 2001
- Known limitations
- The project lists no plan for automatic SMS clearing, RCS support, or Android 9 and earlier.checked 11 Oct 2001
- License
- The project is released under the MIT License.checked 11 Oct 2001
- Permissions
- The project describes all listed Android permissions as optional and explains they support features such as call control, contact matching, SMS screening, and calendar-based rules.checked 11 Oct 2001
- Privacy
- The README says offline features collect no data; for online features the API server sees the IP address, TLS/TCP fingerprints, and reported number.checked 11 Oct 2001
- Purpose
- SpamBlocker blocks unwanted calls and SMS without replacing the default call or SMS app.checked 11 Oct 2001
- Reporting
- Users can automatically or manually report numbers to crowd-sourced databases.checked 11 Oct 2001
- SMS behavior
- SpamBlocker takes over SMS notifications, so users should disable notifications from their SMS app to avoid duplicates.checked 11 Oct 2001
- SMS filters
- SMS features include blocking OTP floods, spam database checks, and training a local AI spam SMS filter.checked 11 Oct 2001
- SMS limitation
- The app's SMS log contains received messages only, not sent messages.checked 11 Oct 2001
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