FIELD: GSM compatible mobile communication networks. SUBSTANCE: system has higher-level device or home location register, which includes software required for base functions and respective additional service functions. Software in higher level device is structured to provide first group of software for additional service functions and third group of software for coordination of first and second groups of software, so that third group of software may be adapted by means of addition or removing some service functions of second group of software without affecting first group of software. EFFECT: increased functional capabilities. 21 cl, 3 dwg
