System operation is based on a real cellular base station (with true MMC/MNC)
emulation at frequency channel selected from the list of neighboring cells in any specific
area, under different Local Area Code (LAC). All mobiles within the catcher coverage will
try to log into this emulated network, as the signal strength of emulating base station
exceeds power levels provided by real base stations. During the registration process of
new mobile devices, the catcher grabs relevant information on terminals IMEI and IMSI,
as well as information on down link signal strength at the mobile device antenna.
Collected information on IMSI allows detecting which cellular operator SIM card is used.
In future, this information can be used to force mobile terminal activation and enable its
tracking. IMEI parameters are used to determine mobile terminals model.