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When choosing which conference calling service to do business with, it's a good idea to have an idea of what kind of rates to expect. Most conference call services will charge rates based on the amount of time used, the amount of people or locations involved in the call, a set-up fee or a membership fee, and surcharges for particular calls placed. There are some companies that will charge rates based only on the minutes used. There will be no set up fees, no membership costs, and very few, if any surcharges. The services offered by each will vary as well.