Removable subscriber identification module for a mobile radio terminal

摘要: An ability to hold a record of amount funds prepaid for at the point sale is incorporated within subscriber identity module (or "SIM") mobile radio terminal. This payment will progressively decrease as services network are used according tarif rate which either preprogrammed in SIM or sent by network. The monitors remaining value and, when reaches predetermined minimum value, prevents further calls. blocking station may be effected specific command outputted equipment part station, disabling operation functions, such authentication algorithms, SIM, not sendind acknowledgement