What are the Best Cell Phone Services in the US?

James Hewfanger asks: "Cnet.co.uk has run an article on the five best cell phone services in the UK. These include a text-based service that gets you the number of a licensed cab company in London, Google Maps and Gmail on your phone, a service that can tell what artist and song you're listening to, an online service that backs up all your cell phone contacts and a text-based service that answers any question you can throw at it. What, however, are the five best cell phone services in the US?" Wirefly's cell phone plan comparison tool gives a good up-to-date look of all cell phone plans on the market.