Basically waterproof isn't waterproof. If I can't lap swim with it, it's not waterproof.
Plenty of people already do it. But, what's the point really, Siri's not working and the touch surface also is not working. Checking the time?
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Still worried about health implications when wearing wifi, Bluetooth, Gps, cellular devices all day long on my skin.
The irony is that a lot of people will use those to monitor their health and sport activities (or even their sleeping habits - don't!) while it's still not clear how it will affect us in the long run.
Staying out in the sun is A LOT more harmfull and we mostly survive it (a few people who abuse get cancer).
Bluetooth is very low energy even compared to WIFI, so not sure why you'd be worried.
There had been 30 years of data now on cell phones and earlier cell phones were way worse than what we have now, and its still not conclusively been proved harmful above background noise of other lifestyle choice influences.