Source: http://www.morevisibility.com/blogs/seo/7-factors-that-affect-mobile-search-rankings.html
Many people are using mobile devices these days. And so, more and more businesses make sure that their site is mobile-friendly to accommodate the users. Also, Google data shows that there are more mobile searches than desktop searches in 10 countries including Japan and the US. Hence, it is very important that you know the key points to boost your mobile search rankings.
Boost Mobile Search Rankings
1. Website Speed. Check how fast your site loads. Top ranking mobile pages load in an average of 1.10 seconds.
2. Flash integration. Although Flash is working well with desktop, it is not necessary for mobile pages.
3. Page redirection. Most pages in top mobile organic positions are not redirected. As much as possible do not redirect your users to other pages.
4. Font size. For mobile sites, the average font size should be 15pt. It should be larger than the font size used for desktop.
5. Bullet points. For mobile sites, bulleted points are proven to be more effective.
6. Image displays. Limit your image displays to a maximum of 4. Images affect the load time of the mobile sites.
7. Content length. Reducing your word count for your mobile site content also proves to be very effective in gaining top mobile search ranks.