*Lesson courtesy of Lifehacker.com*

Now that iOS4 is out and about, we thought of the mentioning some shortcuts & tips for all those who downloaded the new OS on their iDevice.  With multitasking, folders, unified inbox, and a plethora of new features, below are some treats to make the transition into the OS seamless and painless.  Hope this helps and the iOS4 was worth the wait.  Hit the link after the jump for a few more tips.  Bon Appetite!
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 the home button. Then just tap on any app you want to quickly switch to it without going back to the home screen. Note: You’ll need at least an iPhone 3GS or later generation iPod touch to use multitasking.
Hold to kill background apps: Currently in iOS4, if an application supports multitasking, it’ll run in the background by default—kind of a strange choice, considering Apple asks you to confirm push notifications for apps. What this means is that as more apps start supporting background processing, you may end up with a ton of apps running in the background that you don’t really need or want running. To remove an application from running in the background, just pull up your quick switch drawer (double-tap the home button), then tap and hold on an app (like you do when you want to delete an app from the home screen until you see a red minus sign (-) on the corner of the app’s icon. Tap it to kill the app.
Name your new playlists: For years, creating new playlists on an iPod created a default “On-the-Go” playlist that you could later sync to your computer and rename from there. Now you can just create and name a proper playlist each time (rather than “On-the-Go 1”, “On-the-Go 2”, etc.).
Built-in spellchecker: The new spellchecker introduces those oh-so-familiar red underlines for words that your device thinks you’ve misspelled. That’s nice to have, but even better, tapping on a misspelled word will suggest proper spellings.
Change your home screen wallpaper: Okay, this one’s mostly for eye candy, but if you always ached for some personality in your home screen background, fire up Settings -> Wallpaper, pick an image you want to use, and set it as your home screen wallpaper. Note: We can’t really imagine what possible reason there is for this one, but you can’t set a wallpaper for the home screen on 3G or first generation iPhones.
Tethering: Okay, you’ll have to pay AT&T a whopping $20 a month for the privilege of tethering, but at least it’s finally an option. To turn it on, head to Settings -> General -> Network -> Internet Tethering.
Tweak your keyboard layout: If you prefer a different keyboard layout from the standard QWERTY, head to Settings -> General -> Keyboard -> International Keyboards -> English to try out an alternative layout for your software or connected hardware keyboard.
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