G2 (which is a rebranded HTC Vision) has been overclocked by XDA-developers member coolbho3000. He has posted his overclock code, which makes an already fast phone even quicker. The dev started at a 1GHz, and pushed it all the way to 1.42GHz. Eventhough T-Mobile did everything they could te prevent anyone form hacking the system (which is pointless). You can download all you need here.