If you already have a Google Voice number you want to continue using as your Google Fiber Phone number, it's a simple process.
To add an existing Google Voice number to your plan:
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Sign in to GFiber using your email and password. You’ll see your account page.
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Under Plan Details, click Change plan.
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In the Overview section, under Additional Services, click Add to plan below Google Fiber Phone.
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Follow the on-screen instructions and select Use your current Google Voice number; then complete the Google Fiber Phone setup flow. Once completed, Google Fiber Phone will use your Google Voice number.