Question: what smartphones are dual sim?
Answer: NUU Mobile G3 64GB/4GB RAM - Unlocked Mobile Phone - Dual-SIM - 13MP + 5MP Rear Camera, 13MP Front Selfie Camera - 2 Year Warranty (Sapphire Blue) ... 
Samsung Smartphone Galaxy S8 64GB UK Version - Midnight Black. ... 
Samsung S8 Plus UK SIM-Free Smartphone - Midnight Black.