Using iOS 4

When it comes to your iPhone or iPod touch's home screen, keep it clean. Store your apps in folders.

A screen orientation lock hasn’t been available on the iPhone, since it uses that space for its ringer button. But, with the introduction of iOS 4, Apple has added a screen orientation lock to the software

With the introduction of folders in iOS 4, you can now organize your iPhone apps into handy, space-saving collections. But that leads to a question: how many apps and folders can you have on the iPhone at one time?

Until the release of iOS 4, the iPhone could – with a very few exceptions – only run one app at a time. Now, though, iPhone running iOS 4 can take advantage of multitasking and run multiple apps at once. Or can they? Despite the hype about the introduction of iPhone multitasking, this isn’t the multitasking we’re used to.

Is the little battery icon in the top right corner of your iPhone not a clear enough indicator of how much juice your battery has left? If so, here’s a trick for getting easier-to-understand information.

Apple's said that the iPhone 4 and 3GS will get the full benefit of the new software, while the 3G will only get some features that are part of iOS 4. If you're an iPhone 3G owner, the decision on whether to upgrade or not may be driven by what features you get, and how important they are to you.

While the iPhone 3G can be upgraded to run iOS 4, there have been numerous reports of difficulties with the upgrade.

There are some good reasons for iPhone 3G owners not to upgrade to iOS 4. Find out what they are here.

Learn all about AirPrint, Apple technology to print over Wi-Fi from iOS devices.

We've always been able to assign different ringtones to the people on our iPhone address book. With the introduction of iOS 4.2, we can now add unique tones to text messages from our contacts, too.

The release of iOS 4.2 in November 2010 brought a number of great new features to iOS devices. From streaming music and video throughout the house with AirPlay to free Find My iPhone services to changes to the interface, iOS 4.2 offers a number of big changes. Read on to learn all about using iOS 4.2's new features.

Find out what printers are compatible with Apple's AirPrint technology for enabling printing from the iPad and iPhone here.