S.C. Code Ann. § 12-36-1310
(B) The use tax imposed by this article also applies to the:
(3)
(b)
(5) gross proceeds accruing or proceeding from the sale or recharge at retail for prepaid wireless calling arrangements.
(a) "Prepaid wireless calling arrangements" means communication services that:
(b) All charges for prepaid wireless calling arrangements must be sourced to the: