In some cases, you may want to add people to a group call that you are already on when you are already on a call.
Adding someone to a group call is extremely easy – you just need to choose Show participants from the call controls and type in the person’s name or phone number in the search box, and click on the Add new participant button.

Frequently Asked Questions
How do you add someone to an existing Teams call?
The possibilities are endless when it comes to creating a group call among people who are already on a call. If you have a call control, then enter the name of the person in the search box of your call controls and then press enter.
Can you do a 3 way call on Teams?
Select the Calls option on your menu bar, type a name or number, and you will be able to make a call. If you make a second call while on your first call, the first one is automatically put on hold. You will need to select More actions (…) > Merge Calls after connecting the second call, on the call controls of the second call.
How do you add a call in Teams meeting?
In order to use the admin center of Microsoft Teams, follow these steps:
You can find your phone numbers by going to Voice > Phone numbers from the Home page.Click on the Assign button after selecting the phone number you would like to assign.
Can I add someone to a Teams meeting if I’m not the Organiser?
A meeting you’ve not organized can be forwarded to someone who else you would like to invite to the meeting. You will receive a notification that you forwarded the meeting request when the recipient receives it, and the organizer receives notification that the meeting request appeared to be sent by you.
Can I be on 2 Teams calls at once?
In Microsoft Teams, it is possible to join multiple simultaneous meetings from different devices at the same time using the same account. Sharing your screen from one device can be as easy as joining two meetings at the same time.