13. A Graphical User Interface (GUI) for inputting and displaying the results of a query on network data captured from a digital mobile phone network, said network data comprising data for a plurality of communications sessions over said network, said network data including a plurality of session related parameters, said query comprising query data for one or more queries to be computed from said network data, and said one or more queries defining a statistic relating to one or more of said parameters; said GUI comprising: a map having at least one clickable icon, said icon providing information on a result of said one or more queries from said statistic and, when clicked, the GUI providing information on data from which said statistic is computed.
13. A Graphical User Interface (GUI) for inputting and displaying the results of a query on network data captured from a digital mobile phone network, said network data comprising data for a plurality of communications sessions over said network, said network data including a plurality of session related parameters, said query comprising query data for one or more queries to be computed from said network data, and said one or more queries defining a statistic relating to one or more of said parameters; said GUI comprising: a map having at least one clickable icon, said icon providing information on a result of said one or more queries from said statistic and, when clicked, the GUI providing information on data from which said statistic is computed. 14. A GUI according to claim 13 , wherein said icon, when repeatedly clicked, enables drill down to said session related parameters.