Google have said that on April 21, 2015, their mobile ranking factors will not only label your site as mobile-friendly, but will also use the results to determine if your site should rank higher in the search results.
Google said this algorithmic change will have a “significant impact” in the mobile search results, impacting all languages worldwide.
Google also said “users will find it easier to get relevant, high quality search results that are optimized for their devices.”
Most modern sites should be build using responsive themes, this makes them automatically compatible with any smartphones.
If you would like me to look at your site and help make it mobile friendly, please give me a call or get in touch here contact me