“Despite Apple’s claims to the contrary, a test by a forum member at Weiphone suggests the iPhone 3GS may already have enough performance to smoothly play full HD video.

By manually copying over videos using file transfer apps on a computer and the iPhone, the community member says he could play up to a 1080p (1920×1080) clip at 30 frames per second at up to a 35Mbps without any lag or stuttering. Although they don’t show in the official iPod app, they work using Apple’s built-in video player when called by a third-party program.”