Having problems with iphone 3gs

It only lets me download very few apps, for example, when trying to update my instagram, it says ''this app requires iOS 4.3". I've tried updating my itunes and i think i've updated the software but i'm not 100% sure? Need help its doing my head in!

Go into settings and go on software update

Sounds like you have a 3g not 3gs.
3g iphones only get 4.2.1 firmware

Apples way of saying "buy a new iphone'
sorry

To be sure you have the right update you can go to the settings.

In there i think you select " about" and it will show you what your phone is running on.

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