According to three sources, the iPhone 15 and iPhone 15 Pro will come with a color-matched braided USB-C-to-USB-C cable in the box.
iPhone 15 Fast Charger Block and 10ft USB C to C Cable Cord Long for Apple iPhone 15 Plus/15 Pro Max/iPad Pro 12.9/11 inch/4/3/2 th/Air/Mini/6 Gen, Type C Wall Charging Power
iPhone 15 and USB-C: everything you need to know
[MFi Certified] iPhone 15 Aux Cord for Car, 2 Pack USB Type C to 3.5 mm Headphone Aux Audio Jack Cable Car Stereo Compatible with iPhone 15/ 15 Plus/15 Pro/15 Pro Max
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USB-C and the iPhone 15: All of your questions answered