AT&T and T-Mobile begin verifying calls to protect against spam


Illustration by Alex Castro / The Verge

AT&T and T-Mobile have started rolling out call authentication technology on calls placed between the two networks. Soon, if a phone call is made from one network to the other using a compatible device, then the recipient will see a “Caller Verified” message, and they’ll know for certain that the call isn’t from a spoofed robocall or spammer. AT&T also says it’s testing integrating the data used by this system its Call Protect service, which it started offering for free to its customers last month.

The rollout is the latest step in US mobile carriers’ fight to stop robocalls, and it comes after Federal Communications Commission chairman Ajit Pai ordered them to implement a call authentication system by the end of 2019. Last month, the…

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