One of the most notable changes in the iPhone 15 series is the USB-C connector. The baseline iPhone 15 models, the iPhone 15 and iPhone 15 Plus, have USB 2.0, and the Pro models get the USB 3.2. Ahead of the iPhone 15 series availability, Apple has released a document detailing capabilities that the universally accepted standard brings to iPhones.
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The document also states that the iPhone 15 Pro and Pro Max support USB 3.2 Gen 2 for data transfer speeds of up to 10GBps. The USB-C cable included with the iPhone, however, only supports USB 2.0 protocol. Meaning, you will have to purchase a USB 3.2 Gen 2 compatible cable to get the best out of the iPhone 15 Pro and iPhone 15 Pro Max.
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Apple at the September 12 event announced that the iPhone 15 Pro models support recording ProRes video directly to an external storage in 4K at up to 60 FPS. Apple has also permitted connecting the iPhone to a vehicle that supports CarPlay using a USB Type-C to USB Type-A connector.