FIELD: radiotelephone communications. SUBSTANCE: radiotelephone system 100 has radiotelephone 103 incorporating communication barring and changeable card 105 of subscriber identification module SIM that includes international mobile subscriber identification IMSI. Barring from unauthorized communication is used to introduce logging restriction in radiotelephone system 100 and to log only radiotelephone incorporating SIM card with IMSI located in the range of acting IMSIs encoded in radiotelephone or in case user has logged personal identification number PIN with subsidizing flag for permanent inhibition of acting IMSIs. EFFECT: provision for preventing unauthorized communications. 5 cl, 3 dwg
