Hello, Yong June Kim.
Are you working on a ThingWorx Studio app? Something using VR or AR? I ask because looking through some of the documentation that's the only area where I see specific mention of a mobile app, as opposed to just using the browser on a mobile device.
Let me know a bit more about your use case, and I'll find the proper resource to help us out.
-- Craig A.
Hello Yong June,
A responsive mashup that can work well in computer screen will look strange in Mobile devices.
Just create static Mashup in the size of a general smart phone, and bind the mashup to here
And when you login through FormLogin page, the mashup will be loaded regarding to the Screen resolution