Windows Phone 8.1 upgrade closes the gap with iOS, Android
FROM THE BOLD vibrancy of its Start screen to its new digital assistant, Cortana, Windows Phone 8.1 firmly establishes itself as a top-tier smartphone platform. And that’s critically important, considering that Microsoft’s mobile operating system currently holds a market share of less than 4 percent among U.S. smartphone buyers. If you’re eager to try it out, you can sign up right now for Windows Phone Preview for Developers (go.pcworld.com/winphonedev). (Keep in mind that doing so may void your phone’s warranty.) Otherwise, you’ll have to wait a month or two for your carrier to vet the free update: It will be available to all Windows Phone 8 devices, including the Nokia Lumia line. (Update: Microsoft’s Windows Phone 8.1 (go.pcworld.com/winphonerelease) will be released on June 24, according to a Windows Phone support page, although…