If you are an iPhone user with Siri enabled, you may have a voice biometric feature you are not using. Apple introduced “Hey, Siri” recently as a way to ask for Siri help hands-free. Instead of pressing and holding the iPhone button to get Siri, all you have to do is say, “Hey, Siri.” This is similar to Google’s “Ok, Google.” The big difference with Siri is that you train Siri by speaking “Hey, Siri” three times during a setup process, and then Siri will know to only respond to your voice and ignore everyone else. “Ok, Google” does not have that distinction — yet, anyway. It responds to anyone saying “Ok, Google” on a machine that’s listening for that phrase.