Cheapest SMS over internet that shows own number?

[Ties Brants]

Originally Posted by Stu

I have fishtext on my BB, but I've tried others. I have no problem spoofing my US number on text messages to other countries, but when I text someone in the US, it shows a different number. Does anyone know why it is so hard to send a spoofed number into the US?

Not really an answer to your question, but Skype has the same problem:
"Please note: For SMS sent to mobile phones in USA, China and Taiwan, neither Skype Name nor validated mobile number are displayed. Instead, these SMS will have generic, pre-defined numbers as sender ID."
Help for Skype – user guides, FAQs, customer support

So maybe it just isn't allowed in the USA.