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While the new standard iPhone 15 and iPhone 15 Plus are equipped with a USB-C port, data transfer over a cable remains limited to USB 2.0 speeds of up to 480 Mbps, which is equal to the Lightning port on previous iPhones. Apple confirmed this detail in its tech specs for the devices posted on the company's website.

iPhone-15-USB-C-Port-Event-Still.jpg

The higher-end iPhone 15 Pro and iPhone 15 Pro Max are also equipped with a USB-C port, but those devices support USB 3 data transfer speeds of up to 10 Gbps over a cable. Unlike recent iPad Pro models, this means that the Pro models unfortunately do not support Thunderbolt, which theoretically supports speeds up to 40 Gbps.

iPhone 15 Pro models will require a supported cable, such as Apple's one-meter Thunderbolt 4 Pro cable, to achieve USB 3 data transfer speeds.

All four iPhone 15 models are available to pre-order this Friday and launch September 22.

Article Link: iPhone 15's USB-C Port Remains Limited to Lightning Speeds
 
That link is to the wrong item.

But why do we need to buy a Thunderbolt cable if the iPhone Pros do not support Thunderbolt? Was that an example since that's the only one capable of USB 3.1 that Apple sells?

I've been wanting the switch to USB-C since everything's moving towards that but this is the reason I don't like it. With USB 2.0, I could pick up any USB cable and it would work at that speeds. With 3.0, when it was new, we had to make sure it had the blue part. Here we are, what, 10 years later or so? I still can't grab a cable with a USB-C end and expect it to work at least at 3.0 speeds.
 
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