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Screener - Spam Call Blocker
Free & open source · Android

Block spam and telemarketing calls on Android

Screener is a free, open source call blocker for India that follows your rules. Block or allow calls by number or by the caller name your network sends, from a single pesky caller to an entire series.

View source on GitHub See how it works
  • No internet permission
  • No ads or tracking
  • Android 10+

Activity

  • +91 140 xxx xxxxTelemarketing (140 series)
    Blocked
  • Spam AlertCarrier spam label
    Blocked
  • +91 160 xxx xxxxService calls (160 series)
    Allowed
  • +91 80 71xx xxxxBangalore cloud telephony
    Blocked
Example of the call activity log in Screener

A spam call blocker that stays out of your way

Screener quietly checks calls from unknown numbers and rejects the ones that match your rules.

  • Rules you control

    Block or allow calls with a regular expression on the phone number or on the caller name your network sends. Test a rule before you save it, or block all unknown callers.

  • Works with your phone app

    Screener does not replace your dialer. It only takes Android’s caller ID & spam role, so Google Phone or any other phone app keeps working as usual.

  • Your contacts always ring

    Android never sends calls from saved contacts to the screener, so friends, family and colleagues always get through.

  • Made for Indian networks

    Ready-made rules for 140 series telemarketing, 160 series service numbers and cloud telephony ranges, plus a rule for spam labels sent by Jio, Airtel, Vi or BSNL.

  • Private and offline

    No internet permission, no analytics, no ads and no tracking. Your rules and call log stay on your phone and are excluded from backups.

  • A log of every screened call

    See each call the screener handled, the rule that matched, and the raw details your carrier passed along.

Built-in rules for Indian spam numbers

These rules are ready from the first launch. Switch any of them off, or add your own on top.

RuleMatchesAction
Telemarketing (140 series)Numbers starting with 140
Block
Service calls (160 series)Numbers starting with 160 (banks, insurance, government)
Allow
Bangalore cloud telephonyNumbers starting with 8071
Block
Ahmedabad cloud telephonyNumbers starting with 7935
Block
Ahmedabad cloud telephonyNumbers starting with 7971
Block
Carrier spam labelCaller name containing “spam”, “fraud” or “scam”
Block

How Screener works

  1. Step 1

    Set it as your caller ID & spam app

    Open Screener once and grant the call screening role. You can revoke it any time in system settings.

  2. Step 2

    An unknown number calls

    Android hands Screener the number and the caller name from your network. Saved contacts skip this step.

  3. Step 3

    Your rules decide

    Allow rules are checked first, then block rules. If nothing matches, the call rings, unless “Block all unknown callers” is on.

  4. Step 4

    Every decision is logged

    Rejected and allowed calls show up in Activity on your phone, along with the rule that matched.

Frequently asked questions

Take back your phone

Screener is free software under the GPLv3. Read the code, build it yourself, and make it yours.

Get the source code