| http://www.w3.org/ns/prov#value | - Unlike with long-distance service, however, airtime is generally billed to the customer regardless of whether the customer placed or received the call. [0005] Because having every minute of every call charged for is a major discouragement to consumers wishing to use mobile telephones, mobile service providers generally employ a billing system in which customers pre-pay for a certain number of minu
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