Back in March, Google unveiled audio-calling in Duo but limited it to users in Brazil. At the time of the announcement it promised to bring the feature to the rest of the world “in the coming days,” but the global rollout took a little longer than expected. Nearly three weeks later, it’s finally arrived.
To make an audio call, simply switch the toggle at the top of the screen from video to audio. Like video calling, audio calls works over cellular and Wi-Fi, and is meant to be used “in those moments when video calling isn't an option—like when you’re about to hop on a crowded bus or have a poor network connection.” As Google describes, “Duo audio calls work well on all connection speeds and won't eat up your data.”