How to enable voice ID for 'Hey Siri' on iPhone

[iMore.com]

When you set up a new iPhone 6s or iPhone 6s Plus it'll ask you if you want to use "Hey Siri" voice activation, and then walk you through personalizing it for your voice. If you update your iPhone 6 or iPhone 6 Plus to iOS 9, however, you can set up similar personalization. Here's how!

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