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You can stick an activated Fi SIM in an iPhone if you want. It's undocumented, but it works fine. The only thing I lost was smooth switching between cellular and wifi, but otherwise I've been quite happy with it.

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Do you mean if you do this you will have to do the manual switch every time?

And may I ask which iPhone you have? I have an iPhone 5.

Calls get dropped if you're on wifi and walk outside. iPhone 6.

And iMessage on your root phone number, right?

yep, on my email address & Fi number.

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