Thank you jordi,
There are some mobile phone that are blacklisted and can not use webgl, which is necesary for VR mode.
So you should check if those phones, have webgl activated...
I found the Galaxy S3 can use WebGL, btw theCardboard demo app works fine on this device. Already enable WebGL @ Chrome:\\flags\ restart all, do not work. Where I can find a compatible devices lists for krpano? there is a such list?
an easy way to check it, is to hold on screen to prompt the context menu and check if you have the little planet option
The Little Planet, Fisheye, Paninni and Stereographic view options and others are missing. Just the Normal and Architectonic views are available.