Rumors and speculation that only Apple-approved cables will be able to charge the first USB-C iPhone are sketchy at best.
Apple couldn't get away with proprietary USB-C cables for iPhone 15
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Apple explains why it opposes the USB Type-C unification
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All the rumored Apple iPhone 15 changes and new features
I Love the iPhone 15's USB-C Port, But I Hate What it Represents
iPhone 15 USB-C is a big disappointment — here's why
Apple iPhone 15 Switches to USB-C Charging
Apple Introduces USB-C in iPhone 15 and Internet Cheers As Lightning Cable Gets a Goodbye - News18