| 摘要 |
A mobile telephone user places a call through the communication system to a position call system when they want their geographic position. The call could be initiated in several ways, such as dialing a number, pressing a programmed key, or selecting from a menu. In response to the call, the position call system obtains the geographic position of the mobile telephone from the communication system. The position call system transfers the geographic position to the mobile telephone over the call. The mobile telephone provides the geographic position to the user. The position call system also transfers billing information to the billing system over communication link. |
