Iphone 11 single tray

If it doesn’t already have dual SIM Slots, it will have one traditional slot, and one eSIM. You will need to contact your cellular provider to determine if using the eSIM is possible on their network.

Possibly because yours is from a different region. China, Hong Kong and Macau models will have dual sim slots.

Not in a phone which was not manufactured to hold two sims. Phones sold in most of the world offer one sim tray and an e-sim capability.