Neat use of an SMS anonymous relay, very cool! Ditto on Twilio, we use it at GroupFlier.com and love it, definitely an enabling platform.
Twilio is great. I was hoping I could get this feature coded in a day. Actually, it was done after 2 hours.
This seems to have the same problem that mail relays have; you just try setting your caller ID to every phone number, and then you can spam people in a way that looks like it's LetsLunch spamming them.
That sounds like a really inefficient way to spam people. You might as well send text messages to random numbers directly.
Expected this to use the osmocomBB open source GSM stack. Disappointed.