You need one of the following iPhone models, iOS 12.1 or later, to use two nano-SIM cards, in order to operate Dual SIM: iPhone 13, iPhone 13 and iPhone 13 Pro Max.
All iPhone models that accept eSIM allow customers to use Dual SIM, which enables the use of two active SIM cards at once, and several eSIMs. Dual SIM is made possible by using both an eSIM and a physical SIM. Later iPhone 13 models also support two active eSIMs. Models of the iPhone without a physical SIM tray can accept two active eSIMs.
How many SIM slots does the iPhone 13 Pro Max have?
IPhone 13 pro max may have only one SIM slot because it uses one SIM tray. On the left side of the smartphone is where you’ll find the SIM tray. To eject the SIM tray and insert a SIM card, put a SIM tool into the gap. Note: The documentation folder inside the iPhone box contains the SIM tool.
However, the iphone 13 pro max can use more than one sim by using an eSIM