Project Fi invites are on their way, and they reveal a lot about how Google’s new wireless service will work. 

A series of screenshots posted by a Reddit user show the signup process, with a key provision being that you need to use the Google Voice number tied to your Google account or choose another. 

If you don’t bring in your existing number to Project Fi you can choose another. However, your former number then goes back into the Google Voice pool. So choose wisely.

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