I didn't even know there was a mobile version or app. I just use the regular website in my browser on my phone. it works well enough... i sometimes have to zoom in to make sure I hit the right link, bu that's about it.
coincidentally enough, i fat-fingered into the vB4 on my phone today by accident.
I liked some aspects of it - cleaner look
but not others - too big resolution as noted by booker