> Project Fi isn't supposed to work with Apple phones. Turns out that it does work, somewhat. I hear there's limitations (it only uses the T-Mobile network, none of the international data works)

I have been using Google Fi on iPhone since they allowed it. Supposedly still in beta but works great. It's true that it's limited to T-Mobile (sadly) but it does include international data, same as in Android. Still one of the main reasons to stick with Fi, honestly.