Sometimes when I plug a cable in to charge, the iPhone says it may not work with this device. How does it know it's not an Apple cable?

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    Just let you know it is not reliable. Using official cable would show up this prompt ocassionally. – Ivan Chau Jun 9 '16 at 4:09

Apple has a program called MFi and detects if the cable has a certified chip inside. The chip just says that it's been officially 'Made For iOS.'

  • I don't know about that.. Can you provide some kind of evidence or documentation on this Apple "certified chip"? – voices Jun 9 '16 at 23:20
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    @tjt263, this post goes into detail about the chip’s internals: blog.freedelity.be/… – kirb Jun 12 '16 at 4:57

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