Mobile was born with the consumer market in mind. As mobile has developed for consumer use over the past 20-something years, security hasn’t been much of a priority. Now, with a variety of different operating systems and millions of applications, security on mobiles has become a significant problem—especially in a corporate setting.
http://robertsiciliano.com/blog/2013/07/03/how-mobiles-have-become-a-big-target-for-corporate-networks/