Nokia Corp., the world's largest cellphone maker, unveiled its first handset with a built-in hard drive, taking aim at the market for iPods and other stand-alone digital-music players. Nokia, of Espoo, Finland, said the cellphone, earmarked to go on sale world-wide in the fourth quarter, will be able to store 3,000 songs and have a built-in Wi-Fi radio and camera. Dubbed the Nokia N91, the device will have a retail price of about €700, or about $908, before any subsidies by cellphone-service providers, Nokia officials said. That price compares with about $200 for an iPod mini with a similar storage...