| http://www.w3.org/ns/prov#value | - If the call is billed on a usage sensitive basis, the preamble must state all rates, by minute or other unit of time, any minimum charges and the total cost for calls to that service if the duration of the service can be determined.(3) The preamble must state the name of the information provider and accurately describe the information, product, or service that the caller will receive for the fee.(
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