Note: You must download the Teams app from the iOS App Store or Android Google Play Store. The app is a free download.
To make a call from your mobile phone, open the Teams app and look for the navigation panel on the bottom of the screen.
If the Calls app is not already pinned to the menu bar, click the (…) on the right side of the menu bar.
Click Reorder. The Edit navigation screen appears, drag the Calls icon to the top section of the list using the hamburger icon (the three lines to the right of the app name). Click Done when finished. Note: you may need to drag an icon down from the top list for Calls to fit