>>This got me curious. I googled "how does skype send sms", and after weeding out the propaganda pages, this came up:
>>
>>http://forum.eeeuser.com/viewtopic.php?pid=108312
>>http://sourceforge.net/projects/skype4py/
>>
>>Thanks to the fact that Skype exists on Linux as well. The answer may be somewhere in that Python library.
>
>
>The messages on eeeuser.com seemed to be discussing paying sms charges.
>
>Most or all of the mobile carriers have an email gateway that you can send to for free,
>IF you know who the carrier is.
>I may have jumped to conclusions, but I thought that was why he wanted to resolve who the carrier is.
>
>I have emailed SMS messages before, and I seem to recall even getting replies through the email.
>
>SMS certainly opens up a HUGE amount of connectivity for us as developers!


We are going through this very thing for a client. You must register with each carrier's content aggregator who then issues you a short code that you use to identify who/what you are doing.