One example provided in the Google blog post shows a desktop site that detects a mobile phone browser but diverts all of the mobile traffic to the mobile site home page. For example, a mobile user clicks on a link in the search engine that leads to your blog page or a pages with your services description on a desktop browser, but redirects mobile users to your home page.
“Try to test your site on as many different mobile devices and operating systems, or their emulators, as possible, including testing the videos included on your site,” Google warns
. “Doing so will improve the mobile web, make your users happy, and allow searchers to experience and experience your content fully.”