Why does the FreeStyle LibreLink app for iOS only work with iPhone 7 or later?

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Why does the FreeStyle LibreLink app for iOS only work with iPhone 7 or later?

The app only works with iPhone 7 or later, running iOS 11 or later because the Near-field Communication capability needed for the app to scan the FreeStyle Libre sensor is enabled only in iPhone 7 or later, running iOS 11.