I have had a US Itunes account since it opened up. But I have been living in Germany for the last 2 years, and next month will be getting a new iPhone through t-mobile here in Germany. The question is will I be able to use my US itunes account on my German iPhone, or am I going to be forced to have to open a new German account? Or does anyone know how to make this work?

I'd prefer to keep my US account seeing as how I get an awesome exchange rate converting euros to dollars. Meaning everything is super cheap for me in the US shop.