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Your mobile theme is expected to displya on that device. If you have caching software installed, it may be overriding the live site. You may configure your caching plugin and/or service not to cache mobile pages nor to serve cached pages when mobile devices are detected. To do so, enter the user agents found in the documentation link below to the “rejected user agents” areas in your caching plugin’s settings. Remember to clear your plugin, browser, and device caches before retesting.

https://www.wptouch.com/support/knowledgebase/default-mobile-device-user-agents/#cacheuas