calling cards

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Do you have one. I have one because I need this in my work. But do I have to have this. Although I have one I very seldom give the card to somebody. In a meeting I just give my name and telephone numbers. I have collected a number of them but it is just in my file. Of course I can make use of them but not that often. Maybe sales agents need that much. Do you have one and is it useful? To me it is not that useful.