Apple CEO Steve Jobs described the i Phone 4 – which arrived running i OS 4 – as "the biggest leap since the original i Phone," and the basic design is the one still used for the latest models.The company sold 1.7m handsets in the first three days, which according to Jobs made it the most successful product launch in Apple's history to that point.While the i OS version can be updated easily, the apps on your i Phone also needed to be updated frequently. i OS 6 offers limited support for the i Phone 3GS/4. Whichever i OS you want to upgrade to, first of all, I suggest that you should make a backup before updating i Phone. Sign in the Apple ID and begin the download process. After downloadng, you can sync your i Phone to get ala the updated apps to your i Phone.Again, this can be done either by using a Wi-Fi network or by connecting to i Tunes from your computer. i OS 6: supported devices i OS 6 is only supported on i Phone 4S or newer. i OS 7 supported devices i OS 7 is only supported on i Phone 4 or newer. A backup prevents you from losing any data in case something goes wonky down the line. Tips and Tricks Manually checking for updates by going to the i Tunes App Store is annoying.Therefore, it is recommended that it is done via Wi-Fi.Currently, the latest i OS update available is i OS 9.0.
Not offering i OS 8 on the i Phone 4 will make it harder to keep that united front which could be a pain for developers.
If you need help, see i Pod, i Phone, & i Pad Identification.
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And over time Apple has dropped older handsets from upgrades (the i Phone 3GS for example only runs i OS 6).
But the i Phone 4 was a major evolution of the device which makes the move more significant.