SMS application in PHP [closed]

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I wish to build a sms application in php from scratch.

Please guide me how to develop the product from start to end. Thanks in advance

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First of all you need a sms-gateway or build one yourself (using your cellphone, etc.). This article gives some examples about an existing (low-cost) sms-gateway and how to send messages thru HTTP: http://www.codewalkers.com/c/a/Miscellaneous/Sending-SMS-Thru-HTTP/