Click on the (…) to the left of your Teams profile photo or initials in the top right of the menu bar.
1. Navigate to Settings.
2. Under Settings, select Calls.
From the Calls menu, you can choose additional phones to ring or to forward all your calls to your cell phone. You will need to add the new number the first time you use this feature. It will remember your previous entries. Similar options are available between Calls ring me and Forward my calls. If you were ringing multiple phones at the same time and no longer want to use this feature, ensure Calls ring me is selected, then choose No one else from the dropdown menu to the right of Also ring.