Install the APK
CallVault is not on Google Play. Install it as a signed APK from GitHub Releases and keep it updated by sideloading.
Permissions & onboarding
What CallVault asks for on first run, why each permission is needed, and how it degrades gracefully if you decline the optional ones.
Call-recording law (not legal advice)
Recording your own calls is jurisdiction-dependent. CallVault is transparent but does not announce — the responsibility to inform others is yours.