https://arstechnica.com/gadgets/2023/09/contrary-to-rumors-the-iphone-15-has-a-standard-by-the-book-usb-c-port/

The iPhone 15 lineup's transition from Lightning to USB-C this week wasn’t a surprise to anyone who had been paying attention. Apple had been signaling for months that it intended to switch ports, at least in part to conform with new regulations from the EU and elsewhere that required them to do it.

With the USB-C transition essentially taken for granted, the rumor mill focused on Apple’s implementation of USB-C, namely that the company would limit data and charging speeds for any accessories not certified through its Made for iPhone (MFI) program. Without certified cables, the rumors said, other USB-C accessories would be limited to basic functionality, like 480Mbps USB 2.0 transfer speeds and slower charging speeds. (Reporting from MacStories indicates that the new iPhones support 20 W fast charging, though faster speeds may be possible with higher-wattage adapters; the iPhones can also provide up to 4.5 W of power to a connected accessory like the USB-C AirPods case.) Officially licensed Lightning cables use a small controller chip to verify authenticity, and cables without them can generate error messages and refuse to work.