How can I update my iPhone 3gs to ios 4.3?

I really do hope that someone out there can offer me some guidance on this matter.
I am unable to download Facebook and most other apps. I have already done a Google search for this question and keep ending up at the same guide, telling me that it should be on my phone (the option to update software) however it isn't due to an early operating system. I have tried to do it via iTunes and am running the latest version, but no joy. It says no updates available.
I really hope that someone can assist me with this.
Thank you in advance!

Welcome to the Apple Support Communities
If iTunes told you that you are running the most recent version, you have an iPhone 3G, that is only compatible with iOS 4.2.1. You can't upgrade to a later version

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