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Guide: use your iPhone hands-free with Siri | iOS 9

If the iPhone is plugged into a power source, you don’t have to press and hold the Home button to start Siri.

Simply say, “Hey Siri” and follow up with a request. This is perfect for driving when you don’t want to take your eyes off the road.

If you find that Siri is turning on accidentally then it can be disabled. Open Settings, select General, then Siri and turn off Voice Activation.