Recently, a new version of the mobile version of Wikia appears to have been deployed. While I do think they are some things that improve upon the old version, I personally dislike the fact that there is no edit option since I do 98% of my editing on this site on mobile.
Now it's still possible to edit on a mobile device but you'll need to use the heavier and not optimized for mobile Desktop site. I really wish they would add an edit function back to the mobile version. Since mobile is such a big portion of Internet devices these days and not just on the viewing side.
Also, the new mobile version appears to only be appearing on articles for now.