Back in 2016 Google announced it was testing a new ranking system based on indexing all mobile content first. It seems that after 18 months of experimenting this system is expected to be rolling out in their search results in 2018.
What does this mean? Google will use the mobile version of your site for its rankings, and that will be used for both mobile and desktop based searches. Over the course of the rollout we expect to see sites that don't perform well on mobile devices to take a hit on their rankings.
What should I do to prepare? If you are already running a responsive website, one that adapts to the users' device, now would be a good time to do some testing and we have listed some useful tools below
If your website is not mobile friendly now would be a good time to consider switching to a responsive design. Contact us, and we'd be happy to answer any questions you have there regarding mobile friendly websites.