I have a iphone 3gs and it will not update to the IOS 5.1.1

I have a iphone 3gs and it will not update. I have tried going to settings and it doesnt even show up the software button to check and see if I can update.  I have also tried on itunes to see if i will update and all it says is "the version iphone software (4.2.1) is the current version"
any ideas to help?

Post the model number. You probably have an iPhone 3G.

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