Research In Motion Ltd. began receiving pre-orders for its latest BlackBerry smartphone on Monday in a bid to challenge the success of the Galaxy smartphones and the iPhone in the country\'s vibrant wireless market. Thinner than any of its predecessors, the new BlackBerry 9900 will be officially launched on Sept. 19 via South Korea\'s largest carrier SK Telecom, according to the Canadian handset maker. The latest BlackBerry model will be available through an array of retail channels from a leading online social commerce site to brick-and-mortar stores.