T-Mobile provides their Simple Global Coverage plan as part of UNL customer's T-Mobile plans. To view details on what the plan includes, as well as terms and conditions, visit T-Mobile's global coverage website
Under the section named "What country or destination are you traveling to?" you will use the check coverage option to see details. Only the top option (Simple Global Plans) is available and included.
No additional request is necessary in order to use your device.