Your data is on the garmin servers, and not on your phone, and you can easily switch. Just use the same garmin login you currently use.
The functionality of the app on Andriod and iOS is a bit different when it comes to things like notifications and music player, but that's about it.
Ok, thanks. Does that mean I would be able to have both my android phone and my ipad set up to accept data from vivosmart (since the data is going to the garmin servers), which would allow me to view my history from both devices?