Global mobile data usage has surpassed voice calls as the primary use of mobile networks. Data traffic now makes up over half of all mobile network traffic, fueled by growing use of messaging apps, social media, and mobile internet access on smartphones. Spending on data services has tripled in just two years, reflecting shifting communication preferences of mobile users towards electronic messaging and away from traditional voice calls. Experts predict that by 2015, more people will access the internet using mobile devices rather than computers.