MobileKey Known Issues

Cached Pages

The Boost module can be used to cache pages on your website. Unfortunately, if a page is cached, it is served without accessing Drupal. This means, the redirection offered by the MobileKey doesn't take effect on pages cached by Boost or similar modules.

Also if you have a form of proxy cache (a cache before Apache2,) then the redirection will probably be prevented by that cache early on.