Use Siri hands-free.
You don't always have to hold down the home button to launch Siri. If you have the new iPhone 6S, just say the phrase "Hey Siri" to launch Apple's virtual assistant. (Any phones older than the iPhone 6S must be plugged in to a power outlet for this feature to work.) Just head over to Settings>General>Siri and turn on Enable "Hey Siri" first.