Hi everyone. I am new to all this, so please forgive my lack of knowledge. I upgraded to the new iPhone 4S. I still have my iPhone 4. Every summer I go to Europe and would like to use the my old iPhone 4 there with a sim card. It is set with AT&T. Can this be done? I can buy a sim card there for $14. Last time I was there my phone bill was over $500. What can I do to make my old phone work in Europe. It is set up with 5.0.1.... thanks