To this day, Google uses desktop versions of web pages in its primary index but switching could happen as early as tomorrow. You can read more about web indexes in our website optimization guide.
The fact that Google may start using its index of mobile versions of websites for ranking tomorrow means that we can be well prepared for this step. Learn more about google reverse index here.
As reported by the online search engine Search Engine Land, today more than 60% of all search queries on Google are performed via mobile devices. The number will certainly increase considerably in the future, which is the main reason why Google will also switch to the mobile index.
There has been a lot of talk lately about there that mobile websites on subdomain m are not suitable for Google’s Mobile-First index. The latter, of course, is not true, and for now it doesn’t matter whether you use the mobile version of the website with separate URLs (subdomain m.) Or your desktop version is completely customizable. The only thing that matters is that the contents of both are exactly the same. John Mueller of Google reports that there is no need to modify m mobile sites.