However, the company did not immediately return emails seeking comment.

According to the analysts and media reports that say, Apple may launch two iPhone models with 4.7 and 5.5 inch screens this year to compete with Samsung Electronics Co Ltd's popular Galaxy Note 3 phablets, which have a 5.7 inch display.

Apple's current iPhone models, the 5S and 5C, have a 4 inch display panel.

The company has asked suppliers to manufacture 70-80 million units of the new large-screen iPhones by the end of the year, the Wall Street Journal reported in July.

However Apple's shares were down 0.8 percent at USD 94.81 in late afternoon trading on Tuesday.