Starting on October 18, 2016, AT&T has you covered in Cuba.
Nothing to add or change with your plan. Just talk, text, and use data with your own phone and number.
*Standard domestic messaging rates apply to text, picture and video messages received. Data usage is calculated in full-kilobyte increments and is rounded up to the next full-kilobyte increment.
Pay-per-use rates apply. Actual data speeds vary by device/location. Coverage not available in all areas. Countries and rates are subject to change. Services while roaming are not guaranteed. Certain eligibility restrictions apply which may be based on service tenure, payment history, and/or credit. For additional restrictions, rates, and details, see att.com/wirelesslegal.