Apple will likely add USB-C to iPhone 15, making users buy new cables to replace their Lightning ones. Apple previously removed the 30-pin Dock Connector for iPod, FireWire, and other ports in favor of new standards.
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USB-C iPhone: Timeline of events surrounding Apple's switch to the universal connector
From Apple's first iPhone to the iPhone 14: a visual history - The Verge
Apple September 12 Event: iPhone 15 Charging Port Change to USB-C From Lightning - Bloomberg
Apple's port changing timeline - The Verge
After Type-C Port in iPhone 15, EU May Force Apple To Bring Sideloading for iOS Users Soon: Mark Gurman
The iPhone 15 Is Finally Getting USB-C. Here's What That Means
Apple is changing the charging port with iPhone 15, but it won't be like the last time - 9to5Mac
Apple's port changing timeline - The Verge