FAQ: How do I get access to Groove Dialer?
Groove Dialer is an additional license that your organization will need to provide you with in order to help you make and log phone calls from Gmail, Salesforce, and Groove Flows more easily. Groove admins can assign out any available Dialer licenses your team has through these steps.
If you have a Dialer license, you can follow the steps to install Dialer here.