- There are two ways to upgrade the iOS version of your iPhone4
- via connecting the device to iTunes on a computer
Plug it into your computer and open up itunes -under devices click on your iPhone and then click on check for update.
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- or directly from within the device, but only since iOS 5, it is possible to upgrade the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update
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