Please reference this other post I made here -
To get an understanding of how I was able to quickly gain access to XWiki from outside our network. XWiki works perfectly fine as far as I can tell within a mobile browser. It edits the wiki down to be easily viewable but you lose the 2 side panels. You can easily make up for this though by create a menu to access those areas.
XWiki’s formatting is spot on. I was misjudging that because there was an XWiki mobile app that is up on their site that is broken that somehow mobile viewing might have been broken too. This is not the case. XWiki works fine through a mobile browser but there are rational downsizing of the wiki done to fit mobile screens that you’ll want to anticipate.