Therefore, 720p HD camera resolution provides images that are 1280 x 720 pixels (921,600 pixels - not megapixel), and 1080p HD cameras provide 1920 x 1080-pixel resolution, or 2.1 megapixels. The HD ...
The original iPhone came with a rather pedestrian 2 megapixel camera that performed horribly in low light settings. Even for its time, the camera on the original iPhone left much to be desired.