I have an iPhone 3 8gig with iOS 4.2.1 can i upgrade it to iOS 4 or 5

Hi there,
I have an iPhone 3 8gig with an operating system of 4.2.1 but want to up grade it.  When I'm connected to iTunes it gives me the option to upgrade but it always says that it's up to date.  I rang apple supprot and they advised me that it was possible to upgrade to another operating system and the operator had to go and ask when she came back I was advised to retore my phone, which took about 4 hours, and then restroe to back up and then it should upgrade but it didn't work,  it still has the same operating system.  I'd say that it's not possible with this phone but I thought I'd check with the community to see if there is a way of upgrading. Thanks and hope someone can help.
regards
John

Sorry to report news you do not want to hear, but iOS 4.2.1 is the very latest version that will work on an iPhone 3G. There is no way to upgrade it to any higher version. On the bright side the phone is perfectly usable with this iOS version, although as time goes on more and more apps are updated to require later versions of iOS.

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