Your smartphone is too old.
Bad news, iPhone 3G owners. If you've been looking forward to the new iOS 4.1 Game Center you are in for a harsh blow from reality. Apple's game center site lists the iOS 4.1 devices that will be compatible. Unfortunately, the iPhone 3G is not on there despite packing the correct OS.
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Supported devices include the 4th gen iPod touch, 3rd gen iPod touch, 2nd gen iPod touch, iPhone 4 and iPhone 3GS. I think this might be Apple's way of hinting that it is time to consider an upgrade, eh?