The present invention is directed to verifying information related to one or more transactions using an electronic or telephonic medium, for example. In operation, a user of the electronic or telephonic medium makes phone calls, uses bandwidth or data, or purchases items. Information associated with the transactions is sent to a default location and stored in a data storage location, such as a data storage location. Tariff information associated with the transactions may also be stored in the data storage location. The tariff information and the information related to the transactions themselves are used to generate a first bill. At the end of a time period a second bill is received from the service provider associated with the electronic or telephonic medium. The first bill is cross-verified against the second bill. If any discrepancies are found the user and/or the service provider is notified.