The tag wikis have never been very easy to find, but on the mobile site it is especially hard.
It would be useful to have a learn more... link to tag wikis on the mobile site, from the tag question lists, or from the tag list? As far as I can tell, the tag wikis are not particularly discoverable on the mobile site.
Or something subtle, like a little icon beside the tags in the tag list? ( I realize that currently the main site does not even link to the tag wikis from the main tag list page, except for edit... links)