Try Free Tally SMS

It is possible to send sms through Tally by just adding one tcp file.
The Tally SMS uses internet based SMS sending service from various service providers to send messages related to sales order, purchases order, payments and receipts as reminders.

The SMS Tally TCP is available for free. Click here to download.
http://www.winjit.com/2009/download/TallySMS.zip

Download the presntation........
http://www.winjit.com/2009/download/SMSAllyPresentation.pdf

Download the user manual........
http://www.winjit.com/2009/download/SMSALLY.pdf