Apple has increased its first quarter 2011 manufacturing orders for its iPhone handset, DigiTimes reports. Apple had initially placed orders for 19 million iPhones with manufacturing partners Foxconn and Pegatron Technology, and now those orders have been upped to as many as 21 million units.

The first-quarter shipment goal for WCDMA iPhones has been adjusted from 13 million units to 14-15 million units, the sources said. The shipment goal for CDMA iPhones, which will be launched in North America and Asia Pacific in the first quarter, is set at 5-6 million units, the sources added.

First quarter shipment totals of 21 million would represent a substantial increase over Apple’s current pace. DigiTimes’ source notes that year-end iPhone shipments in 2010 will total 47 million units, 15.5 million of which will have shipped in the fourth quarter.