You can access the Teams web app at https://teams.microsoft.com.
To use Teams, you need an Office 365 account with a Business or Enterprise Office 365 license plan. For more information, see How do I get access to Microsoft Teams?
Internet Explorer 11
The latest version of Chrome
The latest version of Firefox
To use Teams on your mobile device, download the mobile app from your favorite app store. You can't use the web app on your mobile device.