As you'd imagine, placing an audio call using Duo is pretty straightforward. All you need to do is switch the toggle at the top of the app to 'Audio,' then hit 'New Call.'

That's really all there is to it. We should point out, however, that calls made within Duo take place over the internet, so they'll (quickly) eat up your data.

Call quality is great

We had a play around with Duo's new audio calling feature earlier today and were surprised by how well it works. Placing a call doesn't appear to consume too much battery and the quality is great.

Overall, a win for Google.