This invention generally relates to systems, methods and computer program code for monitoring digital mobile communications networks, in particular digital mobile phone networks, for purposes such as a test, trouble shooting, and evaluation of a network and its usage. A method of processing digital mobile phone network data for analysis, the method comprising: inputting 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; inputting query data for one or more queries, a query defining a statistic relating to one or more of said parameters, to be computed from said network data; operating with said query on said captured network data to determine one or more intermediate statistics; storing said intermediate statistics in a data store for analysis; and displaying a result of said query in a Graphical User Interface (GUI), said GUI comprising a map having at least one clickable icon, said icon providing information on a result of said query from said statistic and, when clicked, the GUI providing information on data from which said statistic is computed.