this phone have added myself because I did not want 2 devices rumschleppen with me. as there is no duosimkarten devices are or were, at least interesting price of Apple, this device is a real alternative. with a program of Samsung, also all data, contacts, etc on the phone can be loaded without losses. Handling is used to transfer passengers for Apple, as more options and settings are available. but after a short time no problem. it both work simcards gleichzeitigt, no problem, it can also be driven in each case individually every simcard to make phone calls or otherwise.