IPhone 3 won't update to iOS 6.0.1?

I just got an iPhone 3 today, it has been used but works fine, but it won't update to iOS 6.0.1. I know its meant to because I was checking stuff on my friends iPhone an it had an update for iOS 6.0.1. On iTunes it says iOS 4.2.1 and it says it's the current update. On my iPhone on settings/general it doesn't have update on it because of the version it is. So why won't it update?

Added (1). I had to update when I first connected it to itunes

Added (2). Sami: I only think it can update because my friends iPhone 3 did and their's still works…
and my phone won't even say there's an update.

Phone shop?

I have only ever had the 4s. But my boyfriend had the 3GS and he tried installing new software. But apparently there not compatible with the phone. Like anything it gets outdated and just doesn't work. He had to buy a newer phone.
Sorry to bring the bad news. Youl just have to use it in the software it's on now

IPhone 3G only goes up to iOS4.2.1. 3GS has 6.0.1

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