Apple just released iOS4 for the iPhone and iPod touch, and now that you've downloaded and upgraded to the much-hyped iDevice update, here's a look at the new shortcuts, settings, and features you'll need to know—and want to use. The New Shortcuts On a little device with just one button and no major forms of interaction beyond tapping a screen, shortcuts can be serious timesavers. Here are the new shortcuts in iOS4 you'll want to know: Hold then drag-and-drop to create app folders: You can now create folders to store and organize the apps on your iPhone's home screen, particularly handy if you're a bit of an app junkie. To create a folder, tap and hold any icon on the home screen until they all start wiggling. Then drag and drop any application on top of another to create a folder with those apps together. Double-tap home for quick app switching: The quick app switching shortcut pulls up your most recently opened applications whenever you double-tap...
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