Carrion

Automatically declines all calls failing STIR/SHAKEN verification.

What?

• Ever receive a spam call and try to call it back, only for it to be out of service or some stranger? This blocks that.
• STIR/SHAKEN provides cryptographic attestation of caller ID and is mandated by law in USA and Canada
• https://www.fcc.gov/call-authentication
• https://en.wikipedia.org/wiki/STIR/SHAKEN
• https://fccprod.servicenowservices.com/rmd?id=rmd_listings

Usage

• Install the app, grant the screening permission, nothing more!
• A call that failed verification will be disallowed and a failure notification shown
• A call that is unsigned will be allowed and a notification shown
  • You can optionally choose to silence or block verification unsigned calls
• A call that is verified will be allowed without any notification
• Calls from contacts or emergency numbers are always allowed

Database Usage

• For extra coverage and to enable functionality on devices without STIR/SHAKEN there is a local database lookup feature
• Calls from numbers matched in the database will not be declined, but will be silenced
• The archive database contains all numbers reported at least ten times in the past 360 data files
• The high confidence database contains all numbers reported at least twice in the past 90 data files + the archive database
• The "full" database contains all numbers reported in the past 30 data files + the high confidence database
• You must manually download the database occasionally
• The database function can be disabled via the delete database button
• There is more information about the database here: https://www.ftc.gov/policy-notices/open-government/data-sets/do-not-call-data

Requirements

• VoLTE must be working
• Your device must have official support for Android 11 or higher
• If seemingly all received calls are unknown/unsigned state, your device/carrier is likely incompatible

Notes

• Contacts permission is NOT required/used for exclusion
  • The system itself will not pass calls from contacts to the active Call Screening app
• The robocaller database is entirely optional, STIR/SHAKEN verification is completely independent
• Internet is only optionally used to download the robocaller database
  • Caller information, stats, and other information is never sent anywhere
• The stats feature is entirely local for the user to observe effectiveness and is never sent anywhere
• The archive database is included in both high and full database and cannot be used on its own
• If you want to switch between databases and you just recently updated you must first delete the database
  • This is because the app doesn't know which is actually saved and both databases likely have the same generation timestamp
• The 'Excluded' stat counts outgoing calls to non-contacts, outgoing emergency calls, and all non-contact calls during emergency callback mode
• Your carrier likely already does filter out calls that entirely fail verification
• Your carrier likely does not filter out calls that are unsigned or partially signed

Device Compatibility

• The below is not a guarantee, just a minimum requirement
• Pixel 4 and newer
• OnePlus 5 and newer
• Fairphone 3 and newer
• F(x)tec Pro¹ X

Known Issues

• May fail to ask for screening permission, close the app and open until it prompts

Credits

• Icons: Google/Android/AOSP, License: Apache 2.0, https://google.github.io/material-design-icons/

Translations

• Chinese (Simplified): Crit
• Croatian: lukapiplica
• Estonian: Priit Jõerüüt
• Galician: josé m
• German: thereisnoanderson
• French: cwpute
• Indonesian: Adrien N
• Norwegian Bokmål: Even Bull-Tornøe
• Portuguese (Brazil): lucasmz-dev
• Portuguese: ssantos
• Romanian: Renko
• Spanish: vzamanillo, gallegonovato
• Ukrainian: Fqwe1

Donate

• https://divested.dev/donate