Exactly one month after BGR’s exclusive report confirming Microsoft was developing an own-brand smartphone, a new report firms up the news. Reporting from Taipei, The Wall Street Journal’s Lorraine Luk and Shira Ovide state that Microsoft (MSFT) is working with component suppliers in Asia to test its own smartphone. No details about the device were provided beyond the claim that the phone’s display measures between 4 and 5 inches, and WSJ’s unnamed sources were not aware of Microsoft’s launch plans. BGR can confirm that this testing extends well beyond Asia; working Microsoft smartphone models running the company’s Windows Phone operating system are currently being tested by a number of people inside and outside the company in the United States.