A faster, cheaper, smarter iPhone goes on sale Friday morning, promising to bring the latest technology to more of the masses while changing the way people find information, their friends and fun. Satellite navigation is one of the biggest additions to the music-playing, picture-taking, Web-surfing, e-mail-reading smart phone from Apple, which has sold about 6 million of the original device so far. So now the phone can know exactly where it is, and potentially how it can help its owner.
