Saying "Hey Siri" to activate Siri by voice is a nifty (and useful) feature, but things can get messy once you start having multiple devices around you, all competing to fulfill your request. With iOS 10 Apple is doing something about it, and it's one of those things that seems to work by magic.
iPhones and iPads try to recognize their owners voice to prevent improper Siri activations at the slightest "Hey Siri" pronunciation, but even that doesn't take care of the issue of the actual owner saying "Hey Siri" at home when he/she's next to an iPhone, iPad, and even Mac (soon), and have a chorus of Siri's asking what to do.
Well, with iOS 10, when you say "Hey Siri" next to several iOS devices, only the closest one will be activated and asks you what to do.
Behinds the scene it's probably using Handoff/Airplay or whatever techniques it can to figure out which devices are nearby, and then figuring out which device is closest to you based on voice volume or so. But the great thing about it is that users won't have to worry about anything and simply enjoy it.
... Sooner or later, Google will also need to figure out this situation, as it's incredibly annoying to say "Ok Google" to your smartphone, and hear that your tablet laying on the table also wants to help.. :)
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