I've recently received my Lime sim card and put it in the phone. I created a Lime account and added minutes. The RAZR phone seems ready to go. My question is......Will the phone work in the US? It seems to be on a Cingular network. If it does work are the roaming charges crazy expensive? It's not that I need to use the phone....I just want to know what I will be charged if by chance the phone rings :-)