The OnePlus 11 comes with dual SIM slots, and you can use two nano SIM cards with the phone. Notably, the OnePlus 11 5G units sold in the U.S. also support eSIM, which means you don't necessarily have to insert a physical SIM card to use a number with your device. It is, however, worth mentioning that you can only have two active numbers at any given point, meaning you can either have two nano SIM cards or a single nano SIM and an eSIM active.