On April 21, 2015, Google released a significant new mobile-friendly ranking algorithm that’s designed to give a boost to mobile-friendly pages in Google’s mobile search results.
One of the best ways to prepare is to test that Google considers your web pages to be mobile-friendly by using its Mobile-Friendly Test tool. More about the algorithm, including ways to bring improve the mobile-friendliness of your pages, is below.
Many brands and companies still do not have mobile friendly websites. A study from Moovweb shows there are clear visibility and ranking consequences, addition to usability consequences.