The mobile commerce is one of the important issues for consumers in the modern society of advanced information technology. Using consumer survey research and statistical regression analysis, this study explores and investigates the relationship between consumers satisfaction on product attributes and their overall satisfaction on cellular phone provider and the possible moderate role played by mobile number portability service. Empirical findings indicate that consumers satisfaction on product attributes (especially on value-added service and communication quality) will positively and significantly influence their overall satisfaction on cellular phone provider. Mobile number portability service generates partial moderation effects on the relationship between satisfaction on product attributes and on cellular phone provider.