When Windows Phone 8 was launched, Nokia CEO said that there was no sign that Microsoft would launch its own WP phone, and even said that "Microsoft's launch of its own WP device is a stimulant effect for the entire system." Now Nokia has changed its rhetoric, is it a hint that Microsoft may be secretly developing WP phones? In a document submitted by Nokia to the US Securities and Exchange Commission, called Form 20, Nokia said: "Microsoft's strategic decision will change, which may be an adverse factor for us. For example, in addition to the Surface tablet, Microsoft may expand its territory and launch and sell its own mobile devices, including smart phones, under its own brand. This may lead Microsoft to focus on its own brand devices and ignore the devices of other manufacturers, including Nokia. "

Before that, Nokia has always welcomed Microsoft to launch its own brand of smart phones. Microsoft also has the experience and ability to launch its own smart phones before. But does the change of Nokia's voice indicate that Microsoft is really developing secretly? If so, where should Nokia go!?