As some of you already know on April 21st, Google will expand use of mobile-friendliness as a ranking signal. This change will affect all mobile searches worldwide.
Mobile-Friendly can be a Responsive design, but also an App that turns your theme into a “mobile version”.
Since we don’t accept themes with mobile Apps because that would fall into a plugin-territory, our choice is Responsive and media queries instead of browser sniffing tools.
Now, for the mobile-friendliness Responsive media queries will be enough and that is the very basic to be qualified as “mobile-friendly”.
New algorithm will also take mobile usability into consideration when ranking sites.
Please test your themes and make sure that we meet and exceed their expectations.
Full schedule of #MobileMadness events→http://t.co/zlQhi605VK. Prepare for the Apr 21 #mobilefriendly ranking change! pic.twitter.com/GnCI62Ou5T
— Google Webmasters (@googlewmc) March 4, 2015