If you’re still using the iPhone 3GS, you might be a bit envious of the iPhone 4′s ability to record in 1280×720 HD resolution because the 3GS can record video at just 640×480 (VGA). The good news here is that if your iPhone 3GS is jailbroken (and we recommended that it is, especially if you find fault with the way Apple “wants” you to use your phone), you can bump the video recording resolution of your phone to a much-improved 1080×800 (XGA). Good deal!
The steps are a bit involved and require that you gain root access to the file system of your 3GS (hit the Source link for detailed instructions). Also, the steps given are for Mac users, so those wanting to do this on a Windows machine must have a higher level of expertise.
To prove that it works, the purpose responsible for the tweak has filmed the below video in the XGA resolution, and it looks quite good! Which makes us wonder: if the iPhone 3GS is capable of XGA video recording, why hasn’t Apple offered this in a software update?