This manual uses a consistent style of writing: references to text and buttons on screens are printed in italics, information that you have to enter yourself is printed in bold.
Click in Teams on the Calls button. A few options like contacts and call history are shown.
To enter a phone number, click Dial a number. A dial pad will appear.
You can also call someone by entering the /call command, followed by a space. Enter a number or name after the space. Type the full name of a person or, for instance, secretariat to reduce the search results.
While in a call, click the three dots to put a call on hold or transfer a call.
To change, among other things, audio and call settings, click your profile picture and then Settings. The options for microphone and speaker can be adjusted at Devices; the call settings can be found at Calls.
Click here for more information about calls in Teams.