1. A method of acquiring tariff charges assessed by a plurality of wireless services providers by a mobile terminal prior to registration, said method comprising the steps of: transmitting a request for tariff information by said mobile terminal to said plurality of service providers, said request including subscriber identification information; determining a tariff charge applicable to said mobile terminal based on a status of a subscriber identified by said subscriber identification information by each of said plurality of service providers; transmitting said applicable tariff charge for each of said plurality of service providers to said mobile terminal; and selectively registering said mobile terminal with one of said plurality of service providers based on said applicable tariff charge.