Even though it has lost its sense of cool, Motorola’s RAZR is still the best-selling cellphone in the U.S. more than four years after it first hit the scene, Electronista reports. The latest NPD Group data puts the device above the second-place iPhone 3G, followed by the BlackBerry Curve, LG (SEO: 066570) Chocolate and BlackBerry Pearl. The clamshell device is almost universally available for free on a contract with carriers throughout the country, and yet because the device’s value has shrunk so low on the market, Motorola (NYSE: MOT) reaps very few benefits from sales. The company has failed to develop a replacement with as much popularity, despite its varied attempts at refreshing the design.