The imminent launch of the iPhone 4 brings with it a new version of the Apple iPhone operating system. The good news for current iPhone 3G and 3GS owners is that they can now upgrade to the OS 4.

The new version brings a number of improvements to your Apple mobile. One improvement is that it enables third-party multi-tasking so you can undertake two tasks at one time. For example you could have your sat-nav running in the background while you write an SMS message. This function won’t be available on the iPhone 3G sadly , but will be supported on the iPhone 3G S.

The mail client is also improved so you can view multiple email accounts in one inbox. Obviously this proves useful for people who might have one business account and a personal email account or just multiple accounts.

iBooks will now be supported on your iPhone , which enables you to download and read a massive library of books onto your mobile. The photo gallery is now more manageable because you can sort your pictures based on where they were taken or who is in them!

The camera has also received and upgrade by getting a 5* digital zoom which makes your photos even better. You can also now use a wireless keyboard on your iPhone.