El acceso a la versión del editor puede requerir la suscripción del recurso Access to the published version may require subscription With the proliferation of BlackBerry, iPhone, and Android phones in the past few years, mobile handsets have gained a new name: smartphone. Smartphones offer enhanced usability, enabling users to enjoy seamless Internet services. Its sophisticated, multifunction touch screen keyboard replaces a tiny keyboard, which had proved a major obstacle to mobile commerce (m-commerce) adoption. As a result, services-including voice search, SNSs (social networking sites), GPSs (global positioning systems), and other downloadable applications-are becoming truly ubiquitous because they are accessible to users regardless of their physical location and time constraints. As of February 2011, the number of downloads from iPhone's App Store exceeded 10 billion [3]. Consequently, there is a growing expectation that m-commerce is finally on its way to becoming a reality, after being a "hot topic" for a decade [36]. Despite this optimism, however, experts see clouds on the horizon. According to a recent survey [29], approximately 70 percent of all SMS (short message service) spam is related to attempted financial fraud. Mistakenly replying to this spam may lead to phishing 1 or to premium rate fraud. 2 Some attacks employ click fraud related to gambling sites, followed by fraudulent loan services [55]. Of even greater concern is "bluesnarfing," in which calls can be hijacked, personal data can be stolen, and other violations can take place [52]. In short, there are an increasing number of unethical practices via mobile telecommunication systems. Deceptive invitations have become
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