I was a long-time Verizon Wireless customer. Yesterday, our family switched to T-Mobile simply because T-Mobile offered my father a $1,000 credit on a $1,800 phone that he wants to buy. After I switched to T-Mobile, I could not use my phone for more than 12 hours because it was locked to the Verizon network. Then, when I tried to make or receive calls, the person on the other end could not hear what I was saying. David Sando, the manager of the Fullerton Amerige Heights Town Center store helped me by giving me a new SIM card. As soon as I got home, I began to experience the same exact problem. When I try to make or receive calls, the person on the other end cannot hear what I am saying. Tomorrow, I am going back to Verizon Wireless. T-Mobile phone service sucks.