We need to make the config change that is necessary to automatically redirect users on mobile devices to the mobile Wikidata site just like it happens for Wikipedia.
The change may only be deployed once the patches to make mobile Wikidata work sufficiently are deployed.
https://phabricator.wikimedia.org/diffusion/OPUP/browse/production/templates/varnish/text-frontend.inc.vcl.erb;45eae7321e2e2ee15eebb542983dd4bc7b1eb3ad$44
If the above vanish config line evaluates to true then a mobile redirect happens. So we need to add wikidata into the regexps in the lines above.