Because this number is transmitted to the mobile network whenever the phone connects to a cell tower, it theoretically allows the device to be identified and located, even if the SIM card is changed.
For active tracking in the field, police use hardware-software combos often called or IMSI Catchers . imei tracking software used by police free
Police work directly with Mobile Network Operators (MNOs). When a phone connects to a tower, it broadcasts its IMEI. Carriers log which tower the device is hitting, allowing police to triangulate its location. Because this number is transmitted to the mobile