I ran across an article from the New York Times regarding the hows and how much of texting via your flavor of mobile carrier. While the article is a little technical, it explains why it costs the carriers virtually nothing to carry your sms messages. It raises the question of why the carriers have doubled the cost of texting over the last 3 years.
You can read the full article here. It will be interesting to see how the class action lawsuits turn out.
To Your Success,
Tim