A virtual assistant should be able to sense that you need help without making you click a button, shouldn’t it? Siri will always be there with a press of the home button, but a quick change in Settings will make it even easier to get her attention. From Settings, go to General, then tap Siri, and turn Raise to Speak on.
From this point forward, raising the phone to your ear will let Siri know that you need help – or just some company. Also, turning on Hey Siri, located in the same menu, while allow you activate it by saying those words while your phone is plugged in.