I developed my last website about five years ago. At that time the orthodoxy was don't pay too much attention to mobile. But now, it seems quite clear that catering for mobile is very important. I just looked in Google Analytics and was shocked to see for January that only 37% of traffic was Desktop. However, digging a little deeper it seems a lot of this is referral traffic from foreign news sites. The UK, which is still my main market is 65% desktop. My target audience also probably has an average age of 55, which means that there is less mobile than you would otherwise generally find. A few years ago, I got a message in Google Webmaster Tools, telling me to put a viewport meta tag on my site and that failing to do so would likely lead to lower search results on mobile. So, my question is: does a mobile friendly layout increase traffic? And if so can you give a ballpark figure of how much traffic you think will increase?