Mobile first indexing means Google uses the mobile version of your website for indexing and ranking purposes. If you monitor crawlbot traffic to your website, you may see a boost in traffic from Smartphone Googlebot, and the cached versions of pages will usually be the mobile version of the page. Mobile first indexing was introduced due to the increased number of mobile users and now Google uses a smartphone agent to crawl and index your website. Opt for best seo services to get mobile first indexing for your website. How Does Mobile First Indexing Works? If you have a website that is responsive, Google will crawl themobile version of the site to collect content and later, index..