I have an iPhone 3GS and I want to update to iOS 4.2.1.  In my settings I don't even have the ability to "update software."  What should I do?

I have an iPhone 3GS. I want to update to iOS 4.2.1.  In settings, general, I do not have a software update option.  What to do?

You won't see this until you update to iOS 5.  You'll have to update using iTunes by going to the Summary tab of your sync settings and clicking on Check for Update (you will probably be prompted that there is an update available when you connect your phone and open iTunes).

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