I'm coming in to the US for about a month - is there anyway to get a pre-paid or monthly data/voice service in California for my iPhone? I don't know if I can live without 3G data services while I am out and about and don't want to try and track down wi-fi hot spots all the time in cities I'm not that familiar with. On the flipside is their a California wide Wi-Fi service that has tons of hot spots? Or am I better with a monthly data plan if there is such a thing? Thanks for your help y'all!