The full designation of an SMSC according to 3GPP is Short Message Service - Service Center (SMS-SC).8522076203 SMS can be directed in several ways: The tasks of an SMSC can be described as When a user sends a text message (SMS message) to another user, the message gets stored in the SMSC (Short Message Service Center), which delivers it to the destination user when they are available.
SMSCs can be used to interface with other applications, for example a spreadsheet can interface with the SMSC allowing messages to be sent SMS from an Excel spreadsheet, or to send an SMS from Excel.
Inbound messages to a long number or short code can also be passed through the SMSC allowing m2m communications or Telematics.
Once deleted, the SMS message will no longer be available for dispatch to the recipient mobile phone (even if it comes on line).
The validity period should be regarded by the handset user as a request, as the SMSC itself can be configured to ignore or otherwise handle message delivery schedules.