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Message: <blockquote data-quote="joeeattaboy" data-source="post: 2277268" data-attributes="member: 281120">CSD is circuit-switched data, something T-Mobile uses for certain data connections along a dedicated channel. The fact that the CRS wouldn't know this strikes me as odd. Somewhere along the way, those two phones made some kind of data or voice connection using this service. Your brother is going to have to contact them directly to find out why the charges are there.</blockquote>