In the coming summer I will be moving to Japan to pursue my business management course. I have asked many representatives but have not got a satisfactory answer. People say that I would require a GSM kind of mobile phone so that I can make calls from Japan. So just wanted to know if I can use any Androids on a network of Japanese carrier . I would like a phone in which you even have 3G, I just need a phone to make some important local calls.