Read Authoritative Articles On The New Mobile Changes
In May 2016, if your site isn’t mobile-ready then be prepared to lose your ranking on the search pages.
These are recent articles related to the Google algorithm update:
When you’re using a mobile device, Google now shows in the search results if the website is mobile friendly or not as you can see from the screenshot here.
Some of the things that Google looks for in a mobile friendly website is if the text runs off the page, are the links too close together, is the font size too small to be read on a mobile screen and many other factors.
The mobile-friendly algorithm is a page-by-page indicator, so it could require time for Google to evaluate each web page, which may be why it will certainly be a gradual rollout. And also depending on how rapid Google crawls and indexes all of the web pages on your site, the influence can take some time to show up.