From the horses mouth:

“Today, most people are searching on Google using a mobile device.

However, our ranking systems still typically look at the desktop version of a page’s content to evaluate its relevance to the user. This can cause issues when the mobile page has less content than the desktop page because our algorithms are not evaluating the actual page that is seen by a mobile searcher.”

Change is coming as Google work continuously on keeping their search engine up-to-date, and in line with the needs of their users.

They go on to says:

If you have a responsive website or a dynamic serving site where the primary content and markup is equivalent across mobile and desktop, you shouldn’t have to change anything.

If you serve different content to your desktop users versus the mobile ones, you may need to rethink that strategy. Why?

Via Search Engine Land

My mobile site has less content than my desktop site. Should I be nervous?

Potentially, yes. Google has said that it will look at the mobile version of your site. If that has less content on page A than the desktop version of page A, then Google will probably just see the mobile version with less content.

This is why Google recommends you go with a responsive approach — the content is the same on a page-by-page basis from your desktop to your mobile site. You can do the same with other mobile implementations, but there is more room for error.

This is why Google recommends you go with a responsive approach — the content is the same on a page-by-page basis from your desktop to your mobile site. You can do the same with other mobile implementations, but there is more room for error.

Make sure you’re aware of the changes taking place and know how to prepare – read the announcement from Google here.

EP.