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iMore Question Does anyone know the IP rating of the iPhone 6s Plus?
Apple has never applied for an IP certification, so you'll probably never get an officially certified rating for this device either. Last year iFixit stated that there were new rubber gaskets added inside which protected some of the more vulnerable parts better, but no where near what Samsung did with their Active line or Sony with their "waterproof" phone (which, as it turns out, was anything but, lol!)
There is this video from last year...expect about the same with these models given their essentially mirrors cosmetically.
iPhone 6 shown to be water resistant