On the 21st of April, Google is set to roll out its Mobile Friendly algorithm, which will have a great impact on the prominence of websites in mobile organic search listings.
It is important to stress at this stage that this update will only affect organic mobile rankings, so your sites prominence will not be affected for desktop searches, however given the continuing rise in mobile searches, it is important to make sure that your website is mobile friendly. If your website is not mobile friendly, this will cause a drop in position within mobile search rankings, which will in turn cause a decrease in traffic to your website.
Speculation at this stage suggests that the currently displayed tag of 'Mobile friendly' will be removed for a slow tag, given that all of the results in the listing are going to be mobile friendly.
So, how are you going to make sure that you are mobile friendly, and not slow? Well, Google has some tools for that. We have discussed Page Speed Insights before, and the benefits it brings to getting the most out of your site, but the second tool taht Google provide will tell you if your site is mobile friendly or not: https://www.google.com/webmasters/tools/mobile-friendly/
The results are provided on a page by page basis, so you would need to go through each page to ensure they are set up correctly, but if the site has been built in a sufficiently structured way, inner pages shouldn't be a problem.
So, in short, if you haven't already got a site that is optimised for mobile, get it sorted; if you have, test it and make sure it passes the Google test; and remember we are always here to help!