SIM Card Tray + Side Keys for iPhone 12 Pro Max (White)
Using Dual SIM with two nano-SIM cards - Apple Support
Amazon.com: Replacement Sim Card Tray for iPhone 12 Pro Sim Card for iPhone 12 Pro Max Sim Card Holder (Graphite) : Cell Phones & Accessories
Amazon.com: Premium Dual SIM Card Tray Slot Compatible with iPhone 12 Pro Max (Pacific Blue, Dual SIM) Including Rubber Ring and SIM Pin : Cell Phones & Accessories