The IMSI-catcher Subjects the telephones in its vicinity to a person-in-the-Center attack, showing up to them as being a desired foundation station in terms of signal toughness. With the help of a SIM, it at the same time logs in the GSM network for a cell station. IMSI catcher detection https://www.shoghicom.com/all-products/integrated-imsi-catcher--mobile-locator-system