Just ahead of the Apple Special Event, a source told Apple Insider that the upcoming phone from the company will come with always-on “Hey Siri” activation, much like “OK Google” service on Android. Siri can do that too but it must be connected to a power for voice activation to work. The current iOS 9 beta doesn’t support the unplugged “Hey Siri” feature making us speculate that they integrated it at the hardware level. Some Android phones have a specialized voice activation monitoring chip to support “OK Google” feature without it eating too much battery life. Well, we just have a few more hours to wait before we find out what Apple’s cooking in its kitchen.
Source: Apple Insider