What is the latest software version available for the iPhone 4?
The latest software version is: iOS 5.0
To  check what software version you currently have - go to Settings >  General > About > then look for the version in the list.
You can learn more about iOS 5.0 here
iPhone 4S ships with iOS5 installed.
Can I upgrade my software using my PC?
Yes. You will need access to a PC or MAC with iTunes installed and  an active internet connection. If you don't have iTunes you can  download it here.
You need iTunes 10.5 to download iOS5.0 so you may need you may need to update your iTunes version first.
Once  you have opened iTunes on your PC or MAC attach your iPhone using the  supplied USB cable. If there is an update available for your iPhone,  iTunes will prompt you to download and install it. Simply follow the  on-screen instructions to download and install the update.
Where can I get more help with upgrading my iPhone software?
There is more information about how to update your iPhone's software here

 
 
 
 
 
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