SMS

          Short Message Service (SMS) is a text messaging service component of phone using standardized communications protocols that allow the exchange of short text messages between mobile phone devices.

Basic services:

SM MT (Mobile Terminated)

SM MO (Mobile Originated)

(3GPP2) SM MO can be cancelled

(3GPP2) User can acknowledge

          The SMS concept was developed in the Franco-German GSM cooperation in 1984 by Friedhelm Hillebrand and Bernard Ghillebaert. SMS text messaging is the most widely used data application in the world, with 2.4 billion active users, or 74% of all mobile phone subscribers.

          Maximum 160 characters can be sending through SMS.

          Messages are sent to a Short message service center (SMSC) which provides a "store and forward" mechanism. It attempts to send messages to the SMSC's recipients. If a recipient is not reachable, the SMSC queues the message for later retry.

          Some providers allow users to request delivery reports, either via the SMS settings of most modern phones, or by prefixing each message with *0# or *N#.

          Transmission of short messages between the SMSC and the handset is done whenever using the Mobile Application Part (MAP) of the SS7 protocol.