This, and many, many other interesting use-cases is quite simple if you port your number to Twilio and create your own carrier inside their service. I did this

This, and many, many other interesting use-cases is quite simple if you port your number to Twilio and create your own carrier inside their service. I did this about 18 months ago and love the results. I manipulate and use the telephone network in many useful and interesting ways, all programatically, through twilio.