Siri is one of the best innovations in communication technology, a domain that has always welcome changing dynamics. We have already eulogized Siri's abilities to change voice accent, enable Hey Siri handsfree mode, turn off Siri on Lockscreen etc.
If you have got the latest iPhone 6s or iPhone 6s Plus, you will surely set up Hey Siri as you will have to pass through this procedure. Moreover, if you update your iPhone 6 or iPhone 6 Plus to iOS 9, you can set up your voice ID.
How to Set Up Voice ID for Hey Siri on iPhone/iPad Running iOS 9
Step #1. Open Settings app on your iPhone → Tap on General.
Step #2. Tap on Siri.
Here, if you find Hey Siri off, then turn it on. And if Hey Siri is on, toggle it OFF and toggle it ON again.
Step #3. Now tap on Set Up Now.
Step #4. Say “Hey Siri” when you are asked to.
Step #5. Say “Hey Siri” once again when you are prompted.
Step #6. Say “Hey Siri” again.
Step #7. Now ask Siri about weather: “Hey Siri, how is the weather?”
Step #8. Finally, say “Hey Siri, it's me”.
Step #9. Tap on Done.
Watch out how to turn on Voice ID for “Hey Siri” in iOS 9.x:
Hey Siri is smart enough to identify your voice, so when you plug in, Hey Siri will activate voice control on your iOS device only if it sounds like your voice.
Many users mistake Hey Siri as a security guard of their iPhones; but this is not the case. Hey Siri is meant to avoid any accidental activation or pranks. Hey Siri cannot protect your iPhone from any intrusion.
If you want to protect your phone's privacy, you should better opt for Home button activation.