Apple is set to release their next major upgrade to iPhone operating system – iOS 4 anytime now (Update: It is available now), which would bring in loads of new previously missing features like Multitasking, fast app switching, 5x digital zoom, folders for apps, backgrounds and others.

Apple had already made it clear that this major OS upgrade would be made available to the users on June 21st, absolutely free of cost! For those with an iPhone 3GS or iPod touch (3rd gen) all of the features included in the firmware will be accessible (except for the iPhone 4 specific features like FaceTime). iPhone 1G and iPod Touch (1st gen) owners would unfortunately miss out of this firmware upgrade since their hardware doesn’t support iOS 4.0

Here is what you have to do to successfully install iOS 4.0 as and when it is made public later today

[How to] Install iOS 4 on Your iPhone or iPod Touch?

Step 1: Make sure you are using iTunes 9.2. In case you have an older version, open itunes, click on Help and then click on Check for updates. Or else go to Apple’s site for the free download.

Step 2: Connect your iPhone or iPod touch to your Mac / PC using the usual USB cable.

Step 3: iTunes must now be launched automatically. If it doesn’t, then open it manually. Your iDevice should now be detected in iTunes.

Step 4: Select your iDevice from the left sidebar. This should open the summary page on the right.

Step 5: To be on the safer side, backup your device. Right click on the device’s icon on left sidebar and select Back Up from the list.

Step 6: Once the backup is complete, click on Check for update button on the summary page of your iDevice.

If the update is available, you would get a notification that iOS 4 is available and it would guide you through the installation.

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Raju is the founder-editor of Technology Personalized. A proud geek and an Internet freak, who is also a social networking enthusiast. You can follow him on Facebook and on Twitter. Mail Raju PP. Follow rajupp