Do you mean you want to use the dial pad to call someone else?
As far as I know, if you want to call someone by phone number, you need to enable Calling Plans. If you have a calling plan enabled, you can call anyone from Teams.
To dial a number from Teams, go to Calls, and then enter the number of the person you want to reach by using the dial pad located on the left. Then click Call.
You can also type the name of a person or group and call them from the dial pad.
For more details about calls in Teams, you could refer to: https://support.microsoft.com/en-us/office/first-things-to-know-about-calls-in-microsoft-teams-2b883a81-dd15-41bd-a6ba-39deef141027
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.