How to get unlock code when the phone does not work with roaming


    Hi All, my grandma using this phone when in US and now she is in Vietnam, this should be more than 6 months trip and I would like to install local simcard in this phone for her using. I found that the phone does not work with Roaming service therefore a call to Customer service cannot be placed, I do not have T-mobile account to have a chat. What is the solution for me to have an Unlock code for this device? Great thanks for your all help.

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