OPAQUE is a system that can track and monitor the whereabouts of any cell phone in a covered area. With geo fencing and special rules it eliminates false alarms.
An international mobile subscriber identity (IMSI) is a unique number, usually fifteen digits, associated with Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) South African GSM providers use a 10 digit IMSI number.
In GSM the IMSI is always transmitted in the clear at lease
