@atpfm @caseyliss Isn't the bulletproof way of iPhone-iPhone transfers just plugging one into the other and follow the prompts? I've done it several times for my own phones now and never seen it fail for others. The only thing that had issues transferring were device-specific things like CarKeys and banking apps that just had to sign in again. Watch transferred transparently, multiple Apple IDs transferred without issue, all app local data copied. I just poked the two phones in my purse and went to the food court, they were all done before I even finished eating.
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@siracusa @caseyliss Certainly doesn't sound like your experience lines up with people using it in the field. Maybe Thunderbolt is overkill? I and others I know just use the USB-C cable in the box.