Software: 3D Touch, TouchID, Always-On "Hey Siri", and iOS 9
In a lot of ways, evaluating iOS 9 from a broad platform-level standpoint is a bit pointless for a device-specific review, so for a high-level evaluation I would refer to our iOS 9 review. However, in order differentiate their devices every year it seems that Apple has a few special features within the OS added for their latest phone. Of course, this is at least partially hardware-related but given that these features are often enabling new user interfaces in iOS it seems more appropriate to look at these as software additions that are enabled by hardware rather than the other way around.
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