Since many Google Voice users grow attached and become closely associated with their Google Voice numbers, we’re making it possible for users in any of the scenarios above to permanently keep the previous Google Voice number on their account.
This means that calls made and text messages sent to your previous number will still reach you, however, your new primary Google Voice number will display on caller ID when you make calls or send text messages.
To keep a previous number on your account, log in to Google Voice, visit the Settings tab, and click “make permanent” next to the number that you want to hang on to. There’s a one-time $20 administration charge to make it permanent, and the process is instantaneous.
Visit the Google Voice Help Center to learn more.
Posted by Eugene Goldfarb, Software Engineer