We will be leaving behind 4 children. (4,5,7,and7). This is our first trip out of the US. We definatly dont want any suprises on our cell phone bill so we will be leaving them turned off. One way or another we are going to call home everyday. Whats the best way? I have read that you can rent cell phones? What about buying a prepaid? Any suggestions? What does everyone else do?