Install the RingCentral application from the store for your device:
Android:
https://play.google.com/store/apps/details?id=com.glip.mobile&hl=en
iPhone:
https://apps.apple.com/ca/app/ringcentral/id715886894
You can sign in with your @kernrc.org account by using "Single Sign-on".
The features in the phone app are the same as the desktop application installed on the Azure Virtual Desktop.