"Smartphones have now overtaken laptops as UK internet users’ number one device. We’re spending two hours online on our smartphones every day; twice as long as laptops and PCs. Ofcom’s 2015 Communications Market Report
"Google Search will be expanding its use of mobile friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact on Google Search results."AdSense
If your business is on the web, then having a mobile friendly (also called mobile responsive) website means you won't be overlooked on mobile devices.