Strand Endoscopy Center. Main: 843-839-2581 Scheduling: 843-839-0795 or 843-839-0796 Billing: 843-839-2582 Fax: 843-839-2585. Strand GI Associates. Main: 843-449-3381 Billing: 843-492-2733. After Hours. If you need to speak with a physician after hours, please call (843) 449-3381 Our answering service will text your message to our physician on ....