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Apple iPhone 15 relegated to USB 2.0 unless you buy the Pro
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
I had a very quick check and I think iPads use an external chip for USB 3 - and there may just not have been space on the iPhone’s logic board for that. I think you’d have to judge it next year - since the base models seem to be using last year’s pro chips - if the base model doesn’t support 3.1 speeds then, something fishy is happening