iPhone 17 Slim's too thin for SIM tray, may not have mmWave
The iPhone 17 Slim won't have a SIM card tray because it is too thin to have one, and it probably won't have mmWave either.
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Why Apple maxes out at two active SIM/eSIMs on its hardware
Using one of a few methods, the eSIM is loaded with the correct subscriber information and activated just like a SIM card.