No one truly has the iOS4 GM seed. Read the developer notes:
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On that note, back in beta 1 there wasn't any support for it in the 3G. We submitted a bug report and Apple confirmed it. They still haven't put it in. We have one more build till we see the final version.
That's because it's not a bug. If it were a bug it would show up in the plist on the 3G and it doesn't. They never intended on including it on the 3G.