Known issues and limitations
Google Voice has the following Known Issues:
Voice can't be used with Google Fi on the same user account
It's not possible to apply a Google Voice for G Suite license to a Google Fi account. However, it is possible to use Voice with a separate account on a Google Fi subscription. A G Suite account with Google Fi will need to cancel the Google Fi subscription before setting up Voice.
Workaround: Set up Google Fi on a separate account, such as a consumer account. Install the Voice app on the Google Fi device and sign in to Voice with the G Suite account.
Voice restricts calling premium rate numbers
Voice blocks calls to premium rate numbers that charge callers added cost not related to long-distance calling (for example, U.S. numbers starting with 900).
Workaround: Use the native dialer app on a mobile phone or other phone service to make these calls.
Classic Hangouts chat cannot be used with Voice for G Suite
Hangouts Chat will gradually replace classic Hangouts in the near future.
Workaround: We recommend you manage calls and text messages from voice.google.com or from the Google Voice mobile app.
If you are a G Suite administrator, see G Suite known issues.