Since the introduction of the consumer group litigation system for the first time in 2008, it has not been activated. Recently, however, some judgments based on consumer group litigation that limit the exercise of consumer rights in mobile communication service contracts have emerged, enabling us to reaffirm the existence of the consumer group litigation system. Although lost in the cases, the contents of the consumer-oriented rights in the mobile communication services are publicized, and there is some earnings that constructing the logic to cope with these problems in the future. However, I think that there are still some unreasonable points in the judgements. In this paper, therefore, I have pointed out the problems through a critical review on judgments and suggested ways to improve them. First of all, though there are a variety of methods of identification, it is obvious restrictions on the right of termination that making the copy of the ID card valid only to terminate contract. Therefore, it is necessary to simplify procedure by referring cases in other countries. Secondly, it’s not reasonable that to judge the value of the service is limited only by granting or opening the line without taking into consideration of the characteristics of the service. It is necessary that after establishing the judgment criteria for the divisibility of the service first. Finally to promote the interests of all consumers, it is necessary to prescribe the right of withdrawal in the mobile communication service usage agreements. I expect this judgment will be a stepping stone to secure consumer orientation in the mobile communication service area.