You want to build a fully featured burner phone with Kotlin that can receive SMS and calls, allowing you to use multiple phone numbers for various purposes such as loyalty cards, prize draws, and selling items online. You'll use Twilio to forward incoming messages and calls to your own number, which can be easily changed or discarded if needed. The application will be deployed on Heroku, and you can configure it to use different Twilio numbers for each purpose. With this burner phone application, you can create new numbers as needed, receive messages and calls, and even block unwanted senders or add voicemail capabilities in the future.