Apple has substantially increased the total order volume of its iPhone orders for the second half of 2011, according to a new report. Citing “Taiwan-based supply chain makers,” DigiTimes reports that the total volume of orders for the iPhone 3GS, iPhone 4 (GSM), iPhone 4 (CDMA), and iPhone 5 has been increased from an original estimate of 50 million units to more than 56 million units. The report states that iPhone 5 orders for the third…