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MacRumors reports that Apple has built a fail-safe software workaround into the iPhone 7 in case the new Taptic Engine home button fails. The iPhone 7 is the first iPhone not to have a physical home button, replacing the old click-enabled home button with a “solid-state” pressure sensitive button that works using haptic feedback instead of button presses.
The iPhone 7’s Taptic Engine feedback is an integral part of iOS 10, and so in case of failure, the phone will automatically prompt you about a temporary workaround if it should fail.
A MacRumors forum member, “iwayne,” discovered the workaround when his haptic feedback button started glitching after his phone switched itself off when it was charging. A notification dialogue alerted iwayne that “The Home Button May Need Service. In the meantime, you can use the onscreen Home button below.” Below the notification is an onscreen Home button that can be used until the phone is fixed.
Source: Apple Offers a Temporary Workaround if the Home Button Fails on an iPhone 7