The Galaxy Z Flip 3 5G and Z Fold 3 5G are single-SIM in the US. No eSIM, too - PhoneArena
Samsung Galaxy Z Flip 3 5G: A cheat sheet | TechRepublic
Samsung Galaxy Z Flip3 5G 8GB/256GB Black (Phantom Black) Dual SIM F71
Universal eSIM for Samsung Galaxy Z Flip 3 5G | Available in 220 Countries | Pay as you Go Mobile Data Internet Services for Samsung Galaxy Z Flip 3 5G