The easiest way I found to send SMS messages in the past was to use SMTP messages. I don't know if the same is true in India, but the US carriers I have used in the past all had SMTP-to-SMS gateways that would allow me to send a short email to a phone number at a specific address that would be translated to an SMS message.
One annoying thing I found is that some carriers have their own version of SMS and instead of sending the messages directly to the phone as proper SMS messages they would just send an update that a message was available and then the end user would have to make a data connection to retrieve the message. If I recall, Sprint and Nextel were the worst about this.
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