HSBC Holdings PLC plans to close credit card call centers in Jacksonville, Fla., and White Marsh, Md., by the end of August. The moves that will eliminate 700 jobs as the company looks to streamline its card operations. The Jacksonville location provides collection services for HSBC's card products and supports customer-service activities. HSBC will continue to operate 12 U.S. centers, which handle customer service, collections and support for its card business. According to its Web site, HSBC's Card & Retail Services division issues MasterCard- and Visa-branded cards, the GM card and AFL-CIO Union Plus cards. HSBC also offers cards to subprime and underbanked consumers through several affiliates. During a conference call with investors last month, HSBC executives said their company would need to reduce its U.S. consumer-finance business to offset heavy credit losses in the mortgage sector.