Google has decided to switch to mobile-first indexing for all Websites starting September 2020.
It announced this on its official blog. Google said when it will switch a domain to mobile-first indexing, it will see an increase in Googlebot’s crawling, while it updates the index to your Site’s mobile version.
Depending on the domain, this change can take some time. Afterwards, Google will still occasionally crawl with the traditional desktop Googlebot, but most crawling for Search will be done with Google’s mobile smartphone user-agent. The exact user-agent name used will match the Chromium version used for rendering.
In Search Console, there are multiple ways to check for mobile-first indexing. The status is shown on the settings page, as well as in the URL Inspection Tool, when checking a specific URL with regards to its most recent crawling.
