Try Plivo instead - it's about a third of your current cost. $3/month is dramatically better than $10.

http://plivo.com/pricing/ (Disclaimer: I was in the same YC batch as Plivo. I do really like the service compared to Twilio or Tropo.)

Tropo is driving your costs up, compared to people with real servers running SER and similar call routers.

Running their own servers is so far out of the range of MVP it's laughable.

I work on the devops team for Voxeo Labs, the company behind Tropo, so I resent the implication that we don't have real servers. :-)

More seriously, I'm familiar with the Tropo API and know that no matter what direction this product goes, Tropo is a capable platform to build it on.

I'm sorry, I didn't mean to imply that Tropo wasn't capable. I meant that at scale, it's more expensive than building your own.

The header of your blog has a link without the www subdomin. It doesn't work.

Good catch! We're fixing this now.