specific to any one telecommunications service; “operational subscriber's line” means an operational subscriber's line connecting a subscriber's premises to the exchange; “paging service” means a telecommunications services that provide subscribers with radio messages, through portable radio equipment used in a given zone, which may be accompanied by a verbal or codified visual message; “private telecommunications services” means telecommunications services established by any person for the sole purpose of satisfying his own communications needs within Kenya and may include telephony service or value added services, radio communication and cable services; “roaming services” means a type of telecommunications or radio communications service that enables subscribers of one mobile cellular communications system to utilise the facilities of another mobile radio communications system with which the subscriber has no direct pre-existing service or contractual relationship to place an outgoing call, to receive an incoming call, or to continue an in-progress call; “satellite mobile telecommunications service” means a service which allows for voice or data communications through the use of mobile terminal equipment and capable of maintaining a direct uplink to or direct downlink from a satellite-based telecommunications network; “satellite telecommunications service” means a telecommunications service provided through connections from earth stations to authorised public or private satellite-based telecommunications system; “service agreement” means any agreement between an operator and a subscriber or subscribers relating to the 10