Mobile phones can provide several different kinds of forensic evidence.
This can include
The EU requires its members countries to retain certain telecommunications data for use in investigations. This includes data on calls made and retrieved. The location of a mobile phone can be determined and this geographical data must also be retained.
There are different methods of retrieving the evidence, starting from simple screen captures over forensic software tools to bit-exact memory damps using JTAG.
The software tools differ in the supported models, connection types and cost. Another criterion is whether they are accepted in court.
The ever-changing mobile phone marked with new models released on weekly basis poses a huge challenge to the forensic examiner. Issues of connective and compatibility arise. In order to compensate for this problem some forensic products come with an update service.
For a detailed discussion see Gubian and Savoldi, 2007.