Siri to recognize 'Her Master's Voice' in iOS 9.1?
If this is correct, the "Hey Siri" phrase will only work with a device owner's voice, preventing a stranger from activating the assistant on another person's iPhone. It also will eliminate Siri from being activated by your teasing friends, circling around you and your iPhone, mocking you by saying "Hey Siri" in an attempt to get your goat.
The Apple iPhone 6s and Apple iPhone 6s Plus, when released starting on September 25th, will be the only two iPhone models that allow users to employ Siri's always-on feature while unplugged. Those using iOS 8 are able to call for Siri and activate the assistant hands-free, but only when their iPhone is plugged in. The new "Hey Siri" setup screen for iOS was discovered in the public beta for iOS 9.1, which was released on Thursday.