The Moto X advances hands-free phone use. Although hands-free options are available elsewhere to make a call or send a text, Moto X opens the door to the entire Web. It relies on Google Now, the virtual assistant that retrieves information when you speak into the phone. Normally, you press something to activate Google Now. That's how Siri works on iPhones as well. With Moto X, you simply say, “OK, Google Now.”
That command is specific to your voice. I asked three colleagues to speak “OK, Google Now” into a phone I trained by repeating the phrase three times. The phone ignored my colleagues, but responded to me instantly once I spoke from the same distance. Sorry, pranksters: You won't be able use this feature to set 3 am alarms on your friend's Moto X.
