S.C. Code Ann. § 33-46-440: Quorum.

Each telephone cooperative shall establish in its bylaws what percentage and/or number of its members shall constitute a quorum and whether proxies will be considered in determining whether a quorum is present for the transaction of business at all meetings of the membership. If less than a quorum is present at any meeting, a majority of those present in person may adjourn the meeting from time to time without further notice.