According to new data released Neilson, the iPhone 3G was the most popular cell phone in the U.S. in 2009. Using data procured from January to October, iPhone 3G users represented four percent of all subscribers, followed closely by the RIM BlackBerry 8300 Series of phones, with 3.7 percent of the market. The Motorola RAZR came in third, with 2.3 percent of the market; only one other phone, the LG enV2, counted for more than two percent. Apple was…