Apple has started manufacturing an 8GB iPhone 4 model that could be sold alongside the brand-new iPhone 5 this fall, according to a Reuters report. The 8GB flash drives for the low-end iPhone 4 are being manufactured by a Korean company, according to two people with knowledge of the matter.Rumors of a low-end iPhone debuting with the iPhone 5 are not new. The idea of a scaled-down version of the iPhone being sold alongside a new model is not new either. Apple has been selling an 8GB iPhone 3GS at a discount alongside the iPhone 4 for the past year, so it’s not going to be a surprise if an 8GB iPhone 4 hits the market this fall.