com.android.providers.blockednumber Copy

This is Blocked Numbers Storage, the Android Open Source Project provider behind the android.provider.BlockedNumberContract API (authority com.android.blockednumber). It stores the list of numbers the user has blocked, and the platform discards calls and messages from numbers in that list while never blocking emergency numbers. Only the system, the default SMS app, the default phone or dialer app and carrier apps can read or write the list, so the blocking feature is tied to whichever app currently holds those roles. In our sample it is signed by the platform or OEM signer on each build, consistent with it shipping inside the system image. For Android Enterprise, EMM and kiosk fleets it is dormant on devices that do not place calls or send messages, so on a data-only or non-telephony kiosk it is irrelevant. Disabling it stops call and message blocking and can cause the dialer or messaging app's block feature to fail, so it should be left in place on devices where users rely on number blocking.

• BlockedNumberContract | android.provider | Android Developers →
• Implement phone number blocking | Android Open Source Project →
• Package signer provenance for com.android.providers.blockednumber - Android System App Database →

• Re-signed by each device maker with its own platform key - 33 different certificates appear across 19 device makers in our sample. That is the signature of a stock AOSP/system package every OEM builds and signs itself, not a single maker's or a third party's preinstall.
• Its largest observed manifest declares 2 permissions: 1 runtime (user-granted) and 1 vendor or uncatalogued.
• Never reported as user-facing, so it runs as a background or system component rather than an app the user opens.