We have actually featured this topic before. It’s proven now that there are big changes within search engine’s algorithms. Company will increase the ranking of sites that are mobile friendly.
Along with this change, Google will start to use more information from indexed apps as a factor when ranking search results for users that are signed-in and have the app installed.
These changes are great news for mobile users as it should help motivate those sites that still don’t have a mobile site to actually build one. Google started highlighting mobile-friendly sites in results last year.
Site admins who want to test their site’s mobile compatibility can use Google’s tools to quickly evaluate the status of a page.