By the way, I can't understand. When you make a call, the phone's IMEI along with other metadata is transmitted to the base station and registered as a charge. Why this circus with horses? This is so that the money does not go through the register, this example worked for many years in Turkey, if the phone was not registered upon import (you brought your personal one, for example) to the country and the IMEI is not in a special register, a fee must be paid for its use (after 60 days, apparently). The collection is quite significant.