You need an sms gateway
"Some Home Automation systems have the ability to accept SMS messages from the users' mobile phones to control lighting and other appliances[citation needed]. The system may send an SMS confirmation when the requested action has been performed or send alerts via SMS[citation needed]. These systems would require a connected mobile phone or access to a gateway."
See here for more detail: http://en.wikipedia.org/wi
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by: CEHJPosted on 2009-01-10 at 04:47:27ID: 23343454
sms *always* costs afaik. Have a look at
http://tinyurl.com/8ywvau