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iOS 4: What you need to know

21.06.2010
The latest update to Apple's mobile operating system arrived on schedule, with on Monday. As with past OS updates, iOS 4 delivers an array of new features and enhancements to some old favorites. But things are different this time as well--Apple is no longer charging iPod touch owners to upgrade. Then again, some customers with older devices won't be able to upgrade at all--the first time that's happened since the 2007 debut of Apple's mobile OS.

Confused? Don't worry--we've got all the information on iOS 4 you need. Our provides a comprehensive run-through of all the major enhancements and additions in this update. But for quick answers to your burning iOS 4 questions, read on.

It was, back when in April. But that changed this year at the Worldwide Developers Conference, when . And it makes sense--while iPhones certainly run the operating system, so do the iPod touch and iPad. Apple doesn't provide definitive numbers on this, but we'd be willing to bet a good portion of the devices that use its mobile OS aren't phones at all. Hence, the name change.

The short answer is "plenty." Apart from the touted 1500 APIs aimed at developers, regular users can count on in this release. The highlights include support for multitasking; folders for organizing apps; Events, Places, and Faces in the Photos app; and lots of Mail enhancements such as a unified inbox and threaded conversations. Other new features include Quick Look for attachments, opening e-mail attachments in other apps (for example, opening a PDF attachment in GoodReader or iBooks 1.1), editing iPod playlists right on the device, and searching the Web or Wikipedia from the Home screen's Search panel.