Can iPhone 3G's be updated from 4.2.1 ios?

I have an iPhone 3G and I'm sick of the games and apps not working because I need a higher iOS and I don't have the money for a new iPhone.

No, iOS 4.2.1 is the newest OS for your iPhone. I would recommend buying a cheep iPhone 3GS off of eBay or Craigslist. With a 3GS, you will be able to upgrade to iOS 6.0.1. The only downside would be that, I'm pretty sure that updates for the 3GS will cease upon the release of iOS7

Hope this helps!

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