There are about a half-dozen countries that have enacted some form of official "do not call" registry and many others that have signed in laws to prevent various types of spammy behavior from running rampant over the telephone system. Unfortunately, little to nothing is done to enforce these laws and the penalties usually aren't steep enough to discourage bad behavior. Google is taking matters into its own hands and giving users a way to fight back. Starting today, a new version of the Phone app is rolling out to Nexus and Android One devices with built-in spam warnings.

The warning feature comes as a part of the phone app's existing Caller ID capability, which already maintains a very thorough directory about various businesses.