As the market competition becomes increasingly intensive, and the profit from traditional voice services margins gradually declines. 3G telecom operators must provide various value-added services and enhance the ARPU (average revenue per user) depending on the consumer behavioral intentions. Therefore, this study uses the TAM (technology acceptance model) as the foundation to further understand consumer's behavioral intention to use 3G value-added services. After reviewing almost all the previous related papers, this study develops a conceptual model of customer adoption. The following conclusions can be reached from the research findings: (1) Twelve important factors are proposed, which are named perceived usefulness, perceived ease of use, perceived security, perceived price, use experience, perceived enjoyment, need for uniqueness, social influence, context and compatibility, gender, age and income; (2) The factors are separated to six types, including general perceptions, sacrifice perceptions, psychographics, applicability, social influence, demographics.