The iPhone 13 is dual SIM.
The iPhone 13 supports the dual-SIM dual-standby function and supports dual nano-SIM cards, which is not compatible with existing micro-SIM cards. Users can select data and voice SIM cards in the Settings. The use of dual card requires the use of two mobile communication services, the simultaneous use of two CDMA mobile communication services is not supported, and only some operators support dual VoLTE.