The service makes use of a Service Centre, which acts as a store and forward centre for short messages. The Service Centre communicates with the Public Land Mobile Network (PLMN) or PSTN via Interworking and Gateway MSCs.
Subscriber originated messages are transported from a handset to a Service Centre, and may be destined for mobile users, subscribers on a fixed network, or Value-Added Service Providers (VASPs). Subscriber terminated messages are transported from the Service Centre to the destination handset, and may originate from mobile users, from fixed network subscribers, or from other sources such as VASPs.
The Short Message Service is supported on most digital mobile phones and some personal digital assistants with on board wireless telecommunications.[4] Text enabled fixed-line handsets are required to receive messages in text format, however messages can be delivered to non-enabled phones using text-to-speech conversion.[5]
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