S.C. Code § 33-46-30
Whenever any notice is required to be given under the provisions of this chapter or under the provisions of the articles of incorporation or bylaws of a telephone cooperative, a waiver thereof in writing, signed by the person entitled to such notice, must be deemed equivalent to such notice. If a person entitled to notice of a meeting attends such meeting, the attendance constitutes a waiver of notice of the meeting, except in cases where the attendance is for the express purpose of objecting to the transaction of any business because the meeting was not lawfully called or convened. If the articles of incorporation or bylaws prescribe notice requirements not inconsistent with this section or other provisions of this chapter, those requirements govern. Notice may be in such forms as prescribed by Section 33-1-410(b). Written notice is effective when mailed, if mailed postpaid and correctly addressed to members or officers as shown in the records of the telephone cooperative. Oral notice is effective when communicated in a comprehensive manner.
S.C. Code § 33-46-30