S.C. Code § 7-13-820
When any person presents himself with a valid South Carolina driver's license or other form of identification required by Section 7-13-710, if he is not licensed to drive, at the polling precinct and his name does not appear on the registration book a manager must call the county registration office from any phone available at or away from the polling precinct. The manager shall give only the name of the elector as it appears on the driver's license or other form of identification. The member of the board of voter registration and elections taking the call must check the records of the board and if the name of the person is found and he is eligible to vote in the precinct the date of birth of the person must be read to the manager who must then ask the person for such date. Upon answering correctly, the person may vote. When a manager is to make a call for such purpose, he must notify the poll watchers who may accompany the manager and have the information repeated to each of them. The manager must fill in the information on the driver's license or other form of identification on a form provided for that purpose before permitting such person to vote. In the event such call is a toll call it may be made collect and the registration office must accept the call.
If the name cannot be verified by the board of voter registration and elections, or if a phone is not available, the poll manager or his designee may permit the person to vote after following the procedures set forth in Section 7-13-830, and the vote must be processed as a provisional vote. The poll manager must be listed as the challenger.
The provisions of this section are in addition to the procedure provided in Section 7-5-440.
S.C. Code § 7-13-820