Check out this graph from StatCounter.
Mobile devices coupled with tablets now outstrip the use of desktop as the primary device for users. Google unofficially confirmed the results when an engineer nonchalantly commented on the topic at a recent event.
That data reflects the US. Canada is slightly different (I assume it’s related to the astronomically high data prices Canadians are gouged with.)
What’s the main takeaway from the charts? Simply, how well does your website respond/perform to mobile devices. Is it well designed? Do the action items display properly, are you getting the right conversions? If not, you’re missing the bulk of visitors now.
You can test your website using Google’s mobile friendly test online.