Short message service (SMS) is a globally accepted wireless service that enables the transmission of alphanumeric messages between mobile subscribers and external systems such as electronic mail, paging and voice mail systems.
SMS is convenient and cost effective for a number of reasons. When you compare it with the cost of airtime for voice calls or wireless web access, SMS is a real bargain. Messages can be received while making voice calls, and there are no busy signals to contend with. Plus, if you should you find yourself in a situation where talking on a cell phone is inappropriate, SMS is silent and discreet. Messages generated by SMS are immediately delivered directly to your phone. There is no need to call an access number, as is the case with voicemail. Also, most carriers offer SMS alerts (information packets, such as stock quotes, sports scores, and news) that can be delivered to your phone at regularly scheduled intervals.
Currently, there are approximately 24 billion SMS messages sent globally each month, with the majority of that traffic occurring in Europe and Asia. In North America most major cellular providers offer either oneway or twoway SMS to their subscribers. With oneway service, you can receive messages; while with twoway service, you can both receive and send messages.
Examples of SMS provider companey: http://www.vfirst.com
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