iOS 4 has been in the process of regular updating. New iOS version offer good features but in iOS 5 there is added features which were not found in iOS 4. So in the picture below I have mentioned some of the comparison of features between iOS 4 and iOS 5.
![IOS 5 VS IOS 4 IOS 5 VS IOS 4](https://www.itrelease.com/wp-content/uploads/2011/08/IOS-5-VS-IOS-4.jpg)
IOS 5 VS IOS 4