Google’s MVNO project relies heavily on the same technology that makes Google Voice work, but you’re not losing anything by using Fi.
News that Google was finally pushing Project Fi invites to a handful of people led to a whole lot of users asking those lucky enough to get in on the action what the experience was like. In doing so, a screenshot appeared that suggested using Project Fi meant destroying your Google Voice account. The dialogue box from the screenshot explains you can either bring your Google Voice number over to Project Fi, or you can use a different number with a caveat explaining your current Voice number will be released if you go with a different number.
If all you know about Project Fi and Google Voice comes from that one screenshot, there’d be plenty of reason to be concerned. Fortunately, after a quick chat with the folks at Google, we know things aren’t nearly as dire as they seem.