Apple has released iOS 4 for the second- and third-generation iPod touch, iPhone 3G, and iPhone 3GS. The fourth major release of Apple’s mobile device operating system—previously called iPhone OS—the new software provides over 100 new features or enhancements, according to Apple. Among these are multitasking, folders, customizable backgrounds for the Home screen, a unified inbox for the Mail application, more fine-grained control…
