If you would like to port an existing phone number from Google Voice (Personal) to CurrentClient, follow these steps:
Unlock your Google Voice (Personal) phone number by logging in to Google Voice and going to Settings -> Account -> Unlock. Note that you may be charged a small fee by Google to do so.
Go to the Port a number page and choose Port Type: Calls & Texts.
Fill out the information on the page.
For the Account Number, enter the phone number you plan to port.
To get the Transfer/Port-away PIN, log in to Google Voice and go to Settings -> Voicemail. Turn on "Call to listen" and set a PIN if one hasn't already been set.
For the Billing Statement, take a screenshot of the Google Voice Settings page and make sure that the phone number is shown on it.