It has been stated that different models in the Apple iPhone 15 series will support differing data transfer speeds, despite the expectation that the 2023 lineup will finally be made up of four USB-C iPhones. It looks like the iPhone 15 and iPhone 15 Plus may still be lumbered with traditional Lightning port speeds while the iPhone 15 Pro and iPhone 15 Pro Max/Ultra get a massive boost.
Apple chose between USB-C and Lightning for iPhone 15 - gHacks
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Real-life iPhone 15 Pro image confirms USB-C port presence as
iPhone 15 USB-C charging cable USB 2.0, doesn't need MFi
The iPhone 15u2019s USB-C port might be as locked down as
iPhone 15 USB-C port — everything you need to know
Apple iPhone USB-C May Offer Similar Speed To The Well-Liked
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The iPhone 15 and 15 Pro Have USB-C, but There's a Huge Speed
USB-C confirmed for the iPhone 15 in new leaked part images
iPhone 15's USB-C Port Remains Limited to Lightning Speeds - MacRumors