The enhanced capabilities of mobile handsets are starting to include activities previously associated with traditional desktop computing capabilities. This extends the mobile handset from being used for connectivity to a range of purposes in both consumer and intelligent networks. This chapter examines the development of mobile service applications from current consumer telecommunication applications including context based services (such as location based services) to mobile internet-based services and the forthcoming applications for intelligent networks. Developments of both consumer and industry services in sectors with complex operations are examined in terms of service interactions by reviewing the adoption factors and the provision of services in terms of service characteristics and business models. This chapter develops conceptual frameworks for better understanding mobile services and mobile use in the context of intelligent networks along with emerging consumer applications.