"Threats to the Government's use of mobile devices are real and exist across all elements of the mobile ecosystem. The enhanced capabilities that mobile devices provide, the ubiquity and diversity of mobile applications, and the typical use of the devices outside the agency's traditional network boundaries requires a security approach that differs substantially from the protections developed for desktop workstations. These are the conclusions of this study, presented to Congress as a joint effort of the Department of Homeland Security (DHS) in consultation with the National Institute of Standards and Technology (NIST) via the National Cybersecurity Center of Excellence, validated and supplemented by input from industry (vendors, carriers, and service providers), industry organizations, and academic researchers. For the purposes of this study, the term 'mobile device' refers to smartphones and tablets running mobile operating systems, as defined in NIST Special Publication 800-53, Revision 4. Mobile phones and the subclass of smartphones represent one of the greatest advances in human communication in history. The world has embraced this technology family as shown by a rapid adoption rate resulting in a global user base, when compared historically to other technologies. According to the Global System for Mobile Alliance (GSMA), the professional body composed of most carriers, mobile network operators and equipment makers, penetration in 2015 reached 4.7 billion unique subscribers globally. By 2020 that number is expected to reach 5.6 billion, meaning that over 70 percent of the world's population will have a mobile subscription."
United States Department of Homeland Security: https://www.dhs.gov/