Google has updated their “Test My Site” tool, and it’s really well done. (For what it’s worth, this site passed but I can improve readability by boosting text size and click target size.)
This is important because if visitors abandon your site, the brilliance of your messaging and calls to action don’t matter. And Google has threatened to reduce your standing on search result pages if your site doesn’t work well on mobile.
So, let’s do this!