There are hereby specifically excluded from the gross receipts or gross sales of a cellular provider, upon which the tax herein levied is calculated, all portions thereof derived from the following:
(1) The furnishings of cellular services which the State of Alabama is prohibited from taxing under the Constitution or laws of the United States of America or the Constitution of Alabama of 1901;
(2) The furnishing of cellular services which are otherwise taxed under the provisions of Sections 40-23-1 through 40-23-36;
(3) Wholesale sales; and
(4) The furnishing of cellular telecommunications service through the use of a prepaid telephone calling card, a prepaid authorization number, or both.