Can I temporarily add data to a data for life account?

    My home is in an area that doesn't have T-Mobile coverage, but when I travel, it's useful.  The 200MB data for life plan I have included with my tablet is perfect.  However, I'll soon be travelling to visit family and staying for a month in an area that has T-Mobile coverage.  I want to know if I can buy additional data for that month and how to do it.

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