At 3 cents a message, my freemium service would go bankrupt fast. Twilio has way overestimated the value they provide. My guess is that AWS will be much cheaper, like 100x - 1000x cheaper.
I'm a long time HN user that just started at Twilio so I'd love to talk to you about your app. Can you email me at jsheehan@twilio.com if you want to talk more?