Current world population (the total number of human beings living on Earth) is about 7.4 billion, according to estimates by the United Nat ions Department of Economic and Social Affairs, Population Division [1]. Statistics and forecasts suggest the total number of mobile phone users worldwide will reach 4.8 billion by 2017 and is expected to pass the 5 billion mark by 2019 [2]. In 2014, ownership of mobile phones reached 60% of Earth’s population. Mobile phone penetration is likely to continue to grow to 67% by 2019.