The Smartphone
Regarding the frequency of use, the smartphone is the most used device to connect. 85% of Internet users have connected to the Internet in the last month through their smartphone, being the most used device to access the Internet for personal reasons (99.8%).
If your website is not designed to support devices like smartphones, then you are not getting the most out of your website.
In a world where everything is digital, Google together with Bing, the largest Internet search engines at the moment, are available for smartphones, your website must be at the forefront of technology and trends. In order not to be behind, update or change your website to support devices of all types, and thus have the highest number of visits to your website.