ConquerSMS is a service for sending out SMS
(Small Message Service) to any mobile telephone in Denmark. You
cannot use this in other countries, since the number format of the
mobile phone is checked for validity before sending out a message
however you might be able to patch it up easily.
Various features are provided, e.g. address
book and possibility to send out multiple messages.
Online demo available
You are able to see the online demo of ConquerSMS from this URL:
Sends SMS to any mobile in Denmark. Source builds on AspMail
for sending out emails.