Technology isn’t flawless. Every once in a while, the device you depend on fails you. Given that our entire digital lives are carried with us on our smartphones, you need to know what to do when things go awry.

This is especially important because Apple recently unveiled the new iPhone 8 and 8 Plus (and the iPhone X, arriving in November). That means millions of iPhone users will soon be changing phones and updating to new hardware and iOS 11, which is due to roll out today.

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