Older iphone (3g) won't upgrade to ios 5???

My bf has an older iphone (model mb702LL) and when we try to upgrade him to the IOS 5, the phone says that it is updated, but its version is only 4.2.1 (8C148).  I suspect its an iphone 3g (not a 3gS).  Anyone has any idea why it won't update?  I thought all the iphones were to update to iOS 5?  Any help, tricks, suggestions, etc. would be welcomed.
Thanks in advance.

A simple visit to Apple's website would have confirmed that iOS 5 is available only for the iPhone 3GS, 4 and 4S

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