I tried to update an app on my iPhone 4. For some reason it won't let me. It says needs iOS 5.0. What does that mean?
It means that your iPhone cannot support the application. You will need to install a new version or jailbreak your phone with iOS 5.0. You can visit the site http://osxdaily.com/2011/12/27/how-to-jailbreak-ios-5-0-1-untethered-with-redsn0w/ to see how you can jailbreak your phone.
its cause.you are two updates behind I have 5.11 already 5.0. is past
If you still have warranty I wouldn't jailbreak it. If you go under settings you can download the update (you need wifi to do it that way)