Apple on Wednesday released iOS 5, its most advanced operating system for mobile Apple devices, along with its iCloud service. 

After waiting a long time, users of devices that run on previous versions of iOS can upgrade their operating systems and gain access to more than new 200 features, many of which have been rumored since July.  

However, before you upgrade, it might be a good idea to follow these steps. Of course, it goes without saying that you must have a compatible device, and you should back up all your data before upgrading. Currently, the iOS 5 is compatible with any device that already has the current version of the iOS installed. The devices compatible with iOS 5 include the iPad and iPad 2, the iPod Touch 3rd and 4th generation models, and the iPhone 3GS, iPhone 4 and iPhone 4S.

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