Google Mobile Algorithm
April 21, 2015 Google will Only Show Mobile Responsive Sites to Mobile Users.
The Google Mobile Algorithm will affect Ranking and Visitors.
More about Google Mobile Algorithm on Google’s Web Master Blog:
http://googlewebmastercentral.blogspot.com/2015/02/finding-more-mobile-friendly-search.html
Check if your site is Mobile Responsive and Validates for the Google Mobile Algorithm using Google’s Mobile Friendly Test here:
https://www.google.com/webmasters/tools/mobile-friendly/