Video Conferencing - Joining a Microsoft Teams Meeting from a smartphone
Even if you don't have a Teams account, you can still join a Teams meeting on the mobile app. Here's how:
In the meeting invite, select Join Microsoft Teams Meeting.

If you don't already have the Teams mobile app, you'll be taken to your app store to download it.
Download the app and open it right from the app store page.
Teams will ask if it's okay to use your mic. Be sure to allow it so others in the meeting will be able to hear you.
Next, you'll be given two options for joining your meeting: Join as a guest or Sign in and join. Choose Join as a guest.

Type your name and tap Join meeting

Once you're in the meeting, you can turn your video or mic on or off by tapping on the centre of the screen to show the meeting controls. Tap again to hide them.