I paid T-Mobile for the months of service I was in California and then when I returned the next year they said I had to purchase another SIM card for the summer. I paid for the two months and then they billed me for the months I was in China after I TOLD them I did not want phone service while I was in China. It is horrible that T-Mobile lied to me and charged me $112 for service that I could not get while in China. T-Mobile does not cover China! Why should I pay when I explained that I would only need the service in the summer in the USA!