I have an international Galaxy S3, made in England with service through Brazil. I'm trying to get data network service in the USA. The local carrier in the US say they have done everything they can. When I had my Galaxy S2, I had a similar problem in which someone was able to change some internal identification number which allowed the US carrier to recognize the phone. Can anyone tell me what number this would be and how to change it? Everything else on the phone seems to work including phone and wifi service. It's only the data service that doesn't work. Thank you.