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What happens if I plug in my friend's iPhone to my iPhone? Well, there are two different scenarios. One is you plug in your friend's lightning iPhone with a USB-C to lightning cable, in which case every single time, the USB-C iPhone will charge the lightning iPhone,
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no matter what the battery state is. If you plug in a USB-C iPhone into another USB-C iPhone, there is a special handshake where the phones talk to each other, and they go, how much battery do you have? And the other one goes, how much battery do you have? And the one with more battery
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And the one with more battery will charge the one with less battery.
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