I have just purchased an iphone 3g, it has the update 4.2.1, but  most of the apps including my tax ap requires me to have 4.3  how do I get my phone to do this or is there someone I can take it to? Or did I just buy the wrong phone?

I wrote everything in the header.

iOS 4.2.1 is the most recent, and probably last, version that an iPhone 3G can run. If you need apps that require IOS 4.3 or later, you're stuck. You should have purchased an iPhone 3GS, iPhone 4 or iPhone 4S, all of which can run iOS 5.
Regards.

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