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>>I have just finished an SMS Texting app for a client, and it is an expensive proposition to do if you want control over what is happening. You must use a content aggregator and then be approved by each of the carriers you will be using to carry the SMS messages. If you google FREE SMS Gateways, you will find a few that will permit you to send them, but you get what you pay for.
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>I'll second that. It's expensive - much more so than you'd expect. It's also hard to directly compare companies that provide this, since they all seem to have their own way of charging for this.

Thanks for the reply Paul. Which SMS Gateway are you using?