Today Google launches its new algorithm which will factor in a web sites responsiveness to a mobile screen size. This is a huge update and is expected to negatively effect roughy 46% of Fortune 500 companies (according to Merkle | RKG).
If you use WordPress, there are a few plugins which can provide you with a mobile version of your site. I’ve used the free plugin WPTouch on many client websites with great success. To check if your site is mobile ready, click here for Google’s mobile-friendly tester.
Here is a link to an article from the Wall Street Journal for more information.