SAN ANTONIO -- SBC Communications Inc. (NYSE:SBC - News) plans to move to a single national brand to provide a more unified presence in the marketplace, making it easier for customers to find and do business with SBC companies. In a press release Tuesday, the company said the move to a single national brand will unify offerings previously marketed through regional brands such as SBC Southwestern Bell, SBC Pacific Bell, SBC Nevada Bell and SBC Ameritech. SBC companies will continue to offer wireless service nationwide through Cingular Wireless, SBC's joint venture with BellSouth Corp. "Adopting a single, unified SBC...