This is my first time using T-mobile sim in Vietnam. Even though it said 3G, the data speed is less than .1 MB up and downs. In vietnam, you pay about $2 for a full month plan using their sim for data that's 3G. But I want to use my US phone number so I want to stay with Tmobile if I can internationally. Is there something I need to do to unlock the data plan that I have to be able to use in Vietnam at full speed?
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