I'm visiting Rome in a few weeks and have been trying to put together an itinerary and buy all my tickets. However, I'm running into lots of things that require telephone calls to book if I'm using a roma pass like an underground colosseum tour and a time slot at villa borghese. I don't want to wait until I'm there to schedule these things, but I'm not sure how to make these phone calls. So, what are the cheapest and easiest ways to do this?? I have an AT&T cell phone and no landline if that helps. Any solutions you could provide would be great. Thanks!