d services (VAS) is a certain term for noncore telecom services, or for all services beyond standard voice calls and fax transmissions. Mobile data services are the main part of mobile VAS. Unless specifically noted, VAS in this chapter only refers to mobile VAS. A content provider (CP) creates contents/applications for mobile subscribers. A pure CP does not have the channels, gateways, or access number for con- necting with an MNO/MVNO. A service provider (SP) in this chapter only refers to a value-added service provider (VASP), which is a third-party provider rather than an MNO or MVNO. SPs have connection channels and access numbers with which they can work as a bridge that integrate contents/applications and access to the mobile network. Usually an SP also creates and provides contents/applications, working as a CP. 13.2.2 Comparison Model There are many factors that influence the development of the new technologies and services, including market scale, customer behavior, regulations, business strategies, Service Delivery Platforms competition, and the interactions among them. To make the comparison logically clear, we build a comparison model. In this model, the comparison is made on two levels: the performance of mobile data services and the influencing factors in this case the corporate strategies and government policies. For the performance, we care about the diversity and prevalence of mobile data services, as well as the profitability for the companies. As for the influencing factors, with the consideration of taking the characteristics of the telecom industry, market characteristics, regulatory policies, and corporate strategies are included in the model. The regulatory policies influence the mobile service market mainly through entry regulation and competition policies to shape the industry structure and to restrict or promote the competition in the market. The corporate strategies involve multiple aspects including technology selection, product and service development, value chain construction, growt