we're using Varnish for caching our pages, and it is configured to differentiate user-agent versions of pages. So mobiles will have different version of page than desktop browser.
From a desktop browser, it's easy to send a "cache-control: no-cache" with CTRL+F5 shortcut. It will enforce Varnish to refresh the page in its cache.
But how to do the same thing from a mobile, how do not have any CTRL key ??
Many thanks Etienne