Short Message Service SMS is today's simplest and cost-effective way to reach a global mobile audience. Thousands of organizations are using messaging already to communicate with customers and employees. SMS was built into the European Global System for Mobile (GSM) standard as an insignificant, additional capability. Yet in many countries SMS was perceived as cheap, and it offered one-to-one, or one-to-many, text communications that could be read at leisure, or more often, immediately. SMS was avidly taken up by young people, forming new cultures of media use.(Goggin & Spurgeon, 2005). Text messaging is instantaneous, inexpensive and personal, and enables numerous applications. In the face of turbulent economic conditions
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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(wikipedia, 2011). The message from the sending mobile is stored in a central short message centre (SMC) which then forwards it to the destination mobile. This means that in the case that the recipient is not available; the short message is stored and can be sent later. Each short message can be no longer than 160 characters, while these characters can be text (alphanumeric) or binary Non-Text Short messages. SMS messages are transmitted over the Common Channel Signalling System 7 (SS7). SS7 is a global standard that defines the procedures and protocols for exchanging information among network elements of wire line and wireless telephone carriers. These network elements use the SS7 standard to exchange control information for call setup, routing, mobility management, etc. Figure 1 shows the typical network architecture for SMS communication. Conceptually, the network architecture consists of two segments that are central to the SMS model of operation: the Mobile Originating (MO) part, which includes the mobile handset of the sender, a base station that provides the radio infrastructure for wireless communications, and the originating Mobile Switching Centre (MSC) that routes and switches all traffic into and out of the cellular system on behalf of the sender.
The other segment, the Mobile Terminating (MT) part,