Your website must be optimized for smartphones. Why? To begin with, most of the top businesses ranking on Google and other search engines have a mobile-ready website. 

Also, 80% of all Internet users have mobile devices. It is now easier for consumers to browse online for products and services from their small-screened gadgets. 

Not only will catering to this help you get more website traffic; it will also boost your conversion rates and sales.

https://advdms.com/blog/5-tips-to-creating-a-mobile-ready-website