Here are some links about the new OS for iPhone. Once again (no suprise) you will either have to have the newest device or buy the new phone. These features wont be avialable for Gen 1 or 3g, only 3gS, and 4g.
http://www.apple.com/iphone/preview-iphone-os/
http://search.twitter.com/search?q=iPhone+4g+OS
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