Calendar has a system for choosing JSPs based on the class of device you're using (mobile or otherwise). Many portlets used to do this kind of thing, but these days...
- We have Responsive Design; and
- The theme required for the special mobile experience (mUniversality) has been removed from uPortal.
I'm certain, furthermore, that if you actually managed to get these JSPs to render, they wouldn't work. They haven't been touched for 3 years... but there have been several changes to the rest of the portlet code in that time.