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I'm curious about this also......I don't have my watch yet.......but I use my old iPhone 5 when I do any type of exercise and such and then I have a 6 + for everyday use........so just curious if information will transfer to both phones or will it only track permanently on the one I'm using at the time......
 
I have two iPhones. Guess I'll try to see what happens. It appears that you can't without pairing it to another device, whic erases everything.
 
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