I have written about Project Fi before, and they had a slightly big announcement to bring us.
In the past Project Fi was only available to @gmail.com addresses. This is good and easy to understand seeing how Project Fi is a Google product much like GMail.
On June 27th, 2017, Project Fi was opened up to G Suite Accounts (like email@example.com).
Now Project Fi is turned off automatically and you will need a G Suite Admin to turn it on in the Admin console.
Please note that Project Fi limits Group Plans to six users, and is not designed for large enterprises.
This is a quick and easy thing for you to use for your company.