Yes! Mobile devices are used to access your site.

You have a website so you know your business depends upon online traffic. Did you know. More than half of digital traffic online now comes from mobile devices such as smartphones and tablets?
A new study suggests about 24 percent of organic traffic to websites just like yours originates from Android or iPhone devices. Another 12 percent comes from tablets such as ipads and Galaxy, Kindle etc.

Here you can see, that the data shows we are now well past the tipping point of Mobile devices versus Desktop devices. Mobile digital media time in the USA is significantly higher at 51% compared to desktop (42%) as the graph data below demonstrates.

Is Your site Mobile responsive? - if you're thinking, "My clients probably dont use a mobile device to view my site, thats just for techies" You're not providing a satisfactory mobile experience, and you will miss out compared to competitors who are.