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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