Updated since 11:44 am EST with stock prices.NEW YORK ( TheStreet) -- Apple ( AAPL) did it. Google ( GOOG) did it. Now it's Microsoft's ( MSFT) turn. The Redmond, Wash., software giant is working with computer hardware manufacturer Asustek to build its own phone. The planned device is a so-called candy bar touchscreen design running on Microsoft's newly introduced Windows Phone 7 operating system, says Northeast Securities analyst Ashok Kumar, who talked with Microsoft's suppliers and design partners.