How to upgrade my iphone 3g to ISO 4.3?

How can i upgrade my iphone 3g to ISO 4.3?

Its called iOS & the 3G can't update past 4.2.1.

The CPU in that device does not have enough internal RAM to support any iOS above 4.2.1
There are still many many many apps available that will work. The trick is finding them. You could try,
https://sites.google.com/site/appleclubfhs/support/advice-and-articles/finding-apps-for-older-devices
Here is an app to help find these vintage apps (it costs 99 cents)
https://itunes.apple.com/...?mt=8&uo=4
and "soon", https://www.facebook.com/...intApps421

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