The specs state that this version supports 2 nano sim cards. One slot can be used as nano sim card slot, and the other can be used as nano sim card slot or memory card slot. That means, this version of iphone supports 2 physical sim cards. I tried to put 2 nano sim cards but the sim card tray does not seem it can accommodate 2 nano sim cards. I searched the internet for instructions and found one. I tried to follow the instructions but I just could not get 2 nano sim cards fit in the sim card tray. Could someone show how this can be done please. Thank you.