how to send sms to cellphone through using coding ?

I want to send message to cellphone through in website writing applicatin code 2005 or highier ?
how to implement it ?
I want clear code with clear working.

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If the owners of don't have a public API (Webservice) then you'll have to create a WebRequest, add ALL the required fields, including hidden ones, manage cookies, etc. It is very error prone, any change in the page will break all your code. I suggest to find another provider wich expose a public webservice, or otherwise buy a SMS Gateway.
Here is a sms provider, not sure if it meets your needs:
Best regards.
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