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Article Source: http://www.articlesbase.com/ – iOS4 Release Time and Date – Official iOS4 Download

ios4, ios4 release date, ios4 download, ios4 release time, ios4 jailbreak

iOS 4, previously known as iPhone OS 4, is a major update to Apple’s mobile OS which brings a handful of significant changesânamely Apple’s implementation of “multitasking” plus the opening up of thousands of APIs to third-party developersâwhile the rest of the improvements are basically tweaks to existing functionality.

We’ll say up front that we like the update. For iPhone 4, iPhone 3GS, and iPhone 3G users (as well as second- and third-generation iPod touch users), iOS 4 will add useful functionality that will make your device more useable than ever. There are, however, some obvious downsides, and we’ll address those in this review.

Because iOS 4 is launching ahead of the new iPhone 4 (and it runs on more devices than just the new iPhone), we’re reviewing it separately from the phone itself. There is some functionality that is specific to the iPhone 4, which we’ll address in that review when it comes out. For the purposes of this review, though, we used iOS 4 on an iPhone 3GSâthe most current iPhone available ahead of the iPhone 4 launch.
Multitasking

The biggest and most obvious update to iOS 4 is the ability for third-party applications to “multitask”âthat is, you don’t have to terminate them in order to do something else in another app. This is functionality that has been requested of Apple since the launch of the original iPhone in 2007, and it has been a long time coming. (Only the iPhone 4, iPhone 3GS, and third-gen iPod touch get multitasking.)

Apple’s own apps have always been able to truly multitask (you can get iCal alerts while playing a game, for example, or listen to music from the iPod app while reading a webpage), but third parties can now take advantage of a limited set of multitasking capabilities in order to make things easier on the user.

Why “limited”? Because iOS multitasking isn’t really multitasking in the traditional senseâit’s certainly not what you get on a desktop computer, or even what you get from Apple’s own iPhone apps. Apple claims that it only allows for certain functionality so that the OS can continue to preserve battery life and performance in a sane manner. So, what exactly can you do with this new feature? Really, the answer isn’t so much that apps will be “multitasking,” but rather that they’ll be “doing a few things in the background”:

* Audio: you can now listen to streaming music from apps, like Pandora or newscasts through the NPR app, while doing other activities on your phone. Previously, you would have to quit out of the app (and therefore stop your music stream) if you wanted to respond to an SMS or read your e-mail, and now that’s no longer the case. Hallelujah.
* VoIP: similarly, you can carry on Voice Over IP calls on services like Skype without having to quit the app if you need to perform other tasks.
* Location: apps that need to poll your location, such as GPS and direction apps, will be able to do so in the background. No longer will you need to keep the app in the foreground just so it can keep track of where you are.
* Local notifications: third-party apps no longer have to rely solely on push notifications if they want to alert you of something on your phone. If you have an alert set in, say, one of Omni’s applications, it can ping you when the time comes instead of having to go through a convoluted series of Internet tubes to get to you. This, of course, reduces your reliance on an Internet connection to get certain types of alerts and helps cut down on overall wireless bandwidth.
* Complete tasks: if you start a task in an application and then switch to another one (such as downloading a new map in your favorite game), it can now complete the task in the background instead of forcing you to sit there and wait on it.
* Fast app switching: this is basically “pausing” an app where it is, which allows you to quickly switch away from it and then switch back, picking up where you left off.

What can’t your third-party apps do while in the background?

* Grab new updates: those of you who were hoping that your Twitter, IM, or IRC client would pull down updates while hanging out in the background will be disappointed. Unless those apps make use of push notifications to alert you of new messages (as the AIM app does), apps won’t be able to check for updates on their own unless they’re in the foreground.
* Work across the entire OS: users have long hoped that some of their favorite apps (such as TextExpander) would be able to work in all parts of the OS, such as Mail and Messages, but that won’t be the case. This isn’t Mac OS X hereâApple still wants to keep each app to itself for the most part.

Now that we’ve told you what the new feature can and can’t do, we’ll tell you how to use it. Anytime you launch an app and then switch to another app, the first app is automatically “backgrounded” and added to your app drawer. You can access this drawer from anywhere by hitting the Home button twice, which will slide your screen up and show you a row of icons that you can swipe through.

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