With more than 150 million mobile phones under operation and a penetration rate close to 80 lines per 100 inhabitants, the Brazilian mobile market is entering in the maturity, where the average rate is equal to 100 lines per 100 inhabitants. Following the trend of these markets, the introduction of the mobile number portability has been concluded in March 2009 and has as main objectives to reduce the switching barriers, increase the level of competition and encourage the switching process among the operators. The purpose of this study is to identify the elements which influence the switching intention and, based on a model, compare the Brazilian mobile market to the German one, considered already mature. For the study, a sample of 202 users was collected in the Brazilian market and 200 in the German one. Applying the Structural Equation Model (SEM), it was possible to identify, in both markets, that the customer satisfaction is a strong antecedent, with great influence in the switching intention. Moreover, the data analysis indicates that in the Brazilian market the service quality has a higher influence than in the German one. For the German users, the perceived price appear to be more important. The results from the hypotheses tests indicate that the perception of the service quality and the perceived price is higher in the German market, while the Brazilian customers still feel high switching barriers. The findings intent to contribute for the academic knowledge due to the investigation of the relationships among the constructs analyzed, and to suggest insights that can help the market players in the development of market strategies.