A mysterious LG device has been spotted online and it's expected to launch soon with Microsoft's latest Windows Phone 8.1 on board.

LG has not made any Windows Phone devices for a long time, but it now seems the company may be gearing up to re-enter the stage. An LG D635 device has popped up and might mark the company's comeback to the Windows Phone space after a long absence.

Nokia has done a great job in boosting the popularity of the Windows Phone platform, and Microsoft has also kept its end of the bargain and added notable improvements to its mobile operating system. Windows Phone devices are now more popular than ever, and more choices will most likely be welcomed by consumers.

This purported Windows Phone device from LG was spotted by AdDuplex founder Alan Mendelevich, who posted the news on Twitter. According to the tweet, the smartphone will pack a 5-inch display with a resolution of 1280 x 720 pixels and will run the latest Windows Phone 8.1 OS out of the box.

As Phone Arena points out, AdDuplex is a cross-promotion network, so it would make sense that it would have access to such essential details. The purported 720p resolution on a 5-inch screen indicates that the LG D635 will make its debut as a mid-range Windows Phone device. If so, the handset should come with an affordable price tag, but nothing is confirmed at this point.

Microsoft's latest Windows Phone 8.1, meanwhile, comes with notable improvements over previous versions of the OS, adding neat new features and bringing the platform on a more level playing field compared to rivals iOS and Android. The latest OS even comes with a new digital assistant, Cortana, which is Microsoft's answer to Apple's Siri and Google Now. Cortana has already stirred plenty of interest worldwide, but hasn't made it outside of the U.S. just yet.

Other heavyweight companies such as Samsung, HTC, and others are also expected to keep making Windows Phone devices, and LG seems ready to join the party as well. It remains unclear at this point just when this Windows Phone 8.1-powered LG D635 will make its debut, but we'll make sure to keep you posted as soon as we learn more.