Google has added a caller verification feature to Android that silently checks whether the person calling you is who their caller ID claims.
The feature is available on Android 12 and later and is built into Google Dialer. When a call arrives, the dialer fires a "confirmation signal" in the background — a check intended to validate that the caller's identity matches their caller ID. Google hasn't published the full technical spec of how that signal is generated or what infrastructure it reaches, so the verification mechanism remains somewhat opaque.
The need is real. Caller ID was designed for call routing, not authentication, and scammers have exploited that gap for decades. Carriers were supposed to close it with STIR/SHAKEN — a protocol framework mandated by regulators — but adoption has been uneven and the resulting verification checkmarks are easy for users to ignore. Embedding the check directly in the dialer, and making it passive, removes the friction without requiring anything from users.
How durable that protection turns out to be depends entirely on what the "confirmation signal" is actually confirming. If it's simply layered on top of existing carrier protocols, Google has improved the interface around a foundation that was already showing cracks.