We'd like to use our phones in the U.S. while we're there for a few weeks, to make calls within the US for maybe booking restaurants, theatres, ringing up for information , but vodafone UK have no 'roaming' facility outside Europe. so texts and calls will be prohibitively expensive. Would it be an idea to buy a cheap PAYG phone there, has anyone done that, or are there complications we hadn't thought of in doing that?