Hi. I have a Galaxy Ace 2. GT 18160. It works fine. The problem is that it eats up all the prepaid credit very quickly. Even when I am not using the phone it costs about $10 a day. I have closed all the applications I can find. Email was synchronised but I stopped that. I have turned the phone off and on again. It still eats up all the credit. Battery goes flat in one day, with almost no use of the device, maybe this is related. Thank you. Mark.