Possible Duplicate:
Send and Receive SMS from my Website

I would love to have a feature on my site that sends Email reminders and SmS(text messages) to people mobile phones.

I been searching around and all I am finding is api's that charge money per SmS message(as low as 1cent per message).

However even at 1cent per message that is still too much. The amount of money I am charging per year could be servilely eroded by just the Sms messages along.

I could of course charge more money for my service or have an add on for SmS messages but I don't think either would work as most people expect it to be free feature and if they have to pay anything that is because of their carrier charging them not the website.

How do other sites do it? I guessing companies like google have their own gateway providers or something like that.

But how about smaller sites what do they do? I can't see them paying per sms text message.