Smartphones now dominate the mobile market share in most developed countries. As of the end of 2013, it is estimated that there were 1.4 billion smartphones and 268 million tablets in active use worldwide. Android leads the smartphone operating system market with 57% global share, followed by iOS with 21% share. For tablets, Android and iOS also dominate the market. The document then provides examples of case studies demonstrating how mobile surveys can be used to collect various types of qualitative and quantitative research data.