| 摘要 |
<p>Mobile terminals are operated in a mobile telecommunications system such as GSM in which data messages such as SMS messages are routed to a destination having a destination address via a routing centre selected from a plurality of available routing centres. A terminal receives user generated data defining data content of an outgoing message and generates a message including a first data field containing a first routing centre address defining a network address of a first routing centre, a second data field containing the destination address, and a third data field containing the user generated data. After receiving an instruction to send the message, the terminal traps the outgoing message and actuates a SIM card processor to compare the first routing centre address with a second routing centre address stored in a memory to which the user does not have write-access. The second routing centre address is determined by administrator of the telecommunications system. If the addresses are different, the first routing centre address is replaced by the second routing centre address in the data field. The outgoing message is released for being routed via a second routing centre identified by the second routing centre address. The routing of messages is thereby controlled by the administrator in a way which over-rides the user control facility.</p> |
