PromozSEO: 1. Google tries to populate more local results on mobile search (SERP) [depends on the intent of the keyword] as mobile searchers are generally immediate shoppers. 2. Google wants the better user experience in-terms of browsing and content-value. That's the reason they rank mobile friendly sites higher on SERP (mobile) [generally].
Would love to hear others.
Plus2Digital Ltd.: But people see the websites on rank 1st page that have even no any mobile version, their web version is ranking on first page even can't read the content with very small fonts.
PromozSEO: Yes, it is still happening as because most of the sites are non-mobile-friendly. But things are changing rapidly. It will be interesting to see what happens in coming days.
Why Mobile SERP Is Different From Desktop SERP? 
