Can you roam with it?? I unlocked my iphone 4 for my girlfriend to use on T-mobile (running 4.3.5) with the gevey sim. Everything works great on it, but we went on a road trip this weekend, and her phone had the gevey welcome message when she lost t-moblie service. I didn't try to re-unlock it, we just shut it off until we got home, then I unlocked it again for her with no issues. Any suggestions??