The popular mobil operating systems (OS) installed in the smart phones include Apple’s iOS, Google’s Android, Nokia’s Symbian and RIM’s BlackBerry OS. Smart phones have become
necessary for consumers and this has boosted the smart phone demand in the market.
With the popularity and functions offered in the smart phones, there has been an
increase in demand (Park and Chen, 2007). According to Smura et al. (2009), in most
developed countries, mobile phone have become an inseparable part of everyday life
and a majority of people carry them all the time.