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Yes, some folks do have both Android and iOS devices. Good to see Google thinking about multi-device/multi-ecosystem interaction. gsuiteupdates.googleblog.com/2019/06/android-2step-ios.html
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FYI, my current favorite multi-device and multi-ecosystem product, @getthemirror. The mirror device is Android, you control it with iOS, and you can use heart-rate monitors and bluetooth audio devices from all sorts of vendors.