-Fi hotspots for passengers, outside sensors, rear-view cameras to assist in parking, and embedded GPSs. www.TechnicalPDF.com Another advantage to carriers of M2M service is the ease of support. Currently, carriers operate large customer service centers for responding to questions about billing and technical issues. Customer service for M2M service is lower than that for handsets because inquiries and customer service requests are only required for the centralized staff members who manage these applications for customers. Using Prepaid Mobile Services Prepaid wireless services are those for which customers pay in advance for mobile voice and/or data services. Prepaid service is most widely offered to customers who do not have credit and who pay cash for service. They "top up" their service, making additional payments when they need more minutes. This contrasts with the postpaid cellular model by which customers are billed for and pay for services after the end of the monthly billing period. In the prepaid model customers give providers a credit card number that is billed every month. Most mobile providers in the United States rely on postpaid customers for the bulk of their revenue, but many offer prepaid as a way to round out their offerings. With postpaid plans, customers receive monthly bills and often sign one- or two-year contracts for their service. The consumption of prepaid service is particularly high in developing countries such as India, Bangladesh, and many African countries. Prepaid is important in areas where most people don't have credit cards or bank accounts. The advantages of prepaid for carriers are mainly the elimination of the costs associated with issuing bills and collecting overdue payments. For some carriers, it's a way to attract lower-income or immigrant customers who don't have credit. In countries where mobile penetration is high and most people already have www.TechnicalPDF.com existing postpaid service, prepaid is another way to add customers. Whether purchasing prepaid directly thr