The Samsung Galaxy S8 Dual SIM contains upgraded hardware and major design changes over the S7 line, including larger 1440p OLED screens with a taller aspect ratio and curved sides on both the smaller and larger models, iris and face recognition plus a new suite of virtual assistant features known as Bixby. It\'s also IP68 dust/water proof (up to 1.5m for 30 mins). The Dual SIM version is hyrbrid allowing you to use one or two SIM cards at a time. The in-house team at 4Gadgets fully test all refurbished and second hand Samsung handsets...