Software giant Microsoft is working on the design for its own smartphone handset, sources have claimed.
Officials at some of Microsoft's Asian suppliers said that the company is testing a smartphone design, although it is not yet clear whether the device will enter mass production.
One person said the screen of Microsoft's smartphone currently being tested measures between 4 and 5 inches, the Wall Street Journalreports.
Speculation has swirled for months that Microsoft would make its own smartphone, after the company unveiled its first homegrown computing device, the Surface tablet in June.
According to the paper, the move suggests the computer-software giant is increasingly adopting a variation of a business model favored by rival Apple, which designs computers and phones along with the software that powers them.