The watchOS 3 feature you may never have to use but might save your life is called SOS. If you press and hold the side button, your watch will call emergency responders in any country using your iPhone’s cellular connection or Wi-Fi, if your watch is connected to a network. The SOS feature will alert your emergency contacts that you’re in trouble and send your location to them. It will also display your Medical ID on your watch face so first responders will have access to your essential info. The side button finally has a real reason for existing.
One watchOS 3 feature we'll be using all the time doesn't even require you to do anything. Your Mac will sense when your Apple Watch is nearby and unlock itself, no password required.
watchOS 3 will be released this fall. Apple just launched a preview site with information on all the new features you can tap into when the next-gen OS rolls out.
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