I got the Injoo One yesterday only to discover that its a one sim. the so called second sim seem to be Nano sim. i dont know what that is. this is how it works. you cant use the dual sim and memory card together. the Nano sim will have pave way for the memory card or vice versa. so you see, its one sim and memory card or dual sim without memory card. the memory card slot is the same as the nano sim. im yet to try this anyway but it seems thats how it works. please someone should help or reply if im wrong.