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Clickatell SMS Gateway

If you wish to send an SMS from a computer, you should first sign up for an account at an SMS gateway such as Clickatell, ViaNett, Nexmo etc. While it is possible to send an SMS through JavaScript alone via HTTP GET (or POST), it is possibly a better idea to send it from the server so that your account credentials are hidden from the user at the client end. The official websites of the gateways contain information about how to send an SMS in various ways.