Reducing International Roaming Call Costs with Multiple Mobile Phone Numbers

摘要

In the existing commercial mobile operation, call setup to an international roaming subscriber is indirectly routed through the home network of the subscriber, which results in the usage of two expensive international telephone trunks. Through multiple mobile phone number assignment, this letter proposes a novel approach that eliminates the non-necessarily international trunk usage, and effectively reduces the network costs for international roaming calls.