Yes! You can make phone calls by clicking the phone icon when you are viewing a Contact’s messages in the Messages view.
If you’re on desktop, the call goes through your computer speaker and microphone. You’ll find that the audio is quite clear even without headphones. For best audio performance, we recommend plugging in a headset and microphone.
If you’re on mobile, you can make a call similarly using either holding your phone as usual, or with a plugged-in headset/headphones.