China's previous attempts at making a homegrown OS, however, have not made headway. All the top smartphone makers in China rely on developing Android-based phones. At the same time, Windows remains the dominant OS on PCs used in the nation.
Liantong said on its website it will have to win the support of handset makers such as Huawei Technologies, Lenovo and others, along with China's mobile carriers, to develop an ecosystem around its OS.
An official promotional video released on Chinese video-sharing site Youku.com showed the COS running on various mobile devices, including the Apple iPhone 4S, the HTC Butterfly, HTC One, HTC One Max phones and the HTC Flyer tablet.
However, HTC, whose devices run on the Android and Microsoft's Windows Phone OS, declined to confirm the products or any future plans to launch COS-based devices.
Last August, the Wall Street Journal reported that HTC was developing a new mobile operating system specifically targeting China.