I will be going to US from next month. I would like to know which US Telco offer the best internet prepaid plan for mobile phones like blackberry,iphones and so on. I will be staying there for a month and will be moving around quite regularly. So I will buy a prepaid sim card and activate the internet service for 1 month and use it for my phone then when I finish my work, I will just keep the sim card. Which Telco do you guys recommend and the cheapest plan. Prefer to have unlimited data or maybe a quota will do. Edge&3G is fine for me. Thanks