| 摘要 |
A method and system for operating a telephony service are disclosed. A telephone network is provided, which may be a physical network or a virtual network hosted by an existing network. Network identities defined by SIM cards, or telephones with built-in SIM cards, are issued to network users. T he SIM cards defines a network identity including a unique network telephone number. The network, which is preferably an intelligent network (IN) is configured to permit telephones of the users to receive calls and/or message s, irrespective of the status of a user's account with the network. In addition , the network is configured to permit users without credit or airtime to make an outgoing call to an intended call recipient, the call being disconnected aft er a predetermined number of rings. This is sufficient to create a missed call notification on a mobile telephone of the intended call recipient. The netwo rk is configured to generate a notification such as a text message or recorded announcement to the intended recipient if he/she is not available at the tim e of the call.
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