Hope you have some luck.
I'm not sure if this applies to all prepaid cards issued in the states but for the most part ours can't be used internationally.
"The Visa® Gift Card is issued by Pathward, N.A., Member FDIC or Sunrise Banks, N.A., St. Paul, MN 55103, Member FDIC, pursuant to a license from Visa U.S.A. Inc. Please see back of card for Issuer. Your card may be used in the United States everywhere Visa debit cards are accepted. The card may not be used at any merchant, including Internet and mail or telephone order merchants, outside of the U.S. or the District of Columbia. See Cardholder Agreement for complete details. Use of this card constitutes acceptance of the terms and conditions stated in the Cardholder Agreement. Distributed and serviced by Blackhawk Network California, Inc."