How to set up iPhone dual SIM cards - Geeky Gadgets
Using Dual SIM with two nano-SIM cards - Apple Support
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Comment: I'd love to see Apple offer dual-SIM iPhones worldwide, but am not optimistic - 9to5Mac
Amazon.com: for iPhone 12 Pro Max Dual SIM Card Tray Replacement for iPhone12 Pro Max Nano Dual SIM Card Tray Slot Holder Adapter + Micro USB Adapter + Eject Pin… (Graphite) :
Using Dual SIM with two nano-SIM cards - Apple Support