Apple is working to build a pair of iPhones for release this year, one a sequel to the company’s prior GSM handsets, and the other built to work on CDMA networks, according to a new report. Citing people briefed by the company, the Wall Street Journal reports that the CDMA iPhone will be built by Pegatron Technology Corp., the contract manufacturing subsidiary of Taiwan’s ASUSTeK Computer, and is scheduled to go into mass production in…