Sprint Nextel Corp., the third-largest U.S. mobile-phone carrier, began touting last year that it had the country’s first nationwide, fourth-generation wireless network. Now it’s fighting to retain its marketing edge.
Verizon Wireless and AT&T Inc., the largest and second- largest mobile phone carriers, both detailed their plans for fourth-generation, or 4G, offerings this week. At the Consumer Electronics Show in Las Vegas, Verizon unveiled 10 devices for its high-speed service, while AT&T introduced 20 products.
The....