This seems off-topic but I have a suspicion a lot of people in this thread will find the twiml for "ring forever" to be useful and interesting:

  <?xml version="1.0" encoding="UTF-8" ?>
  <Response>
      <Pause length="600"/>
      <Hangup />
  </Response>

(that will ring for 10 minutes before hanging up)

I think this will be interesting because there is probably a lot of overlap between people critical of phones and people critical of voicemail ... but it's actually sort of difficult to have a phone without voicemail.

If you disable voicemail with your carrier, it doesn't work the way you think (hope) it will. When you fail to answer, the carrier gives some weird message about the subscriber being unavailable which just makes people think you don't pay your phonebill or something. In short, you cannot, from the standpoint of your carrier, just have no response other than ringing.

But with twilio you can ...