A developer has built a simple SMS chatbot using Python, Flask, and Twilio's Programmable SMS service. The chatbot can recognize two keywords ("quote" and "cat") in incoming messages and respond accordingly by sending a random famous quote or a cat picture. To deploy the chatbot, developers need to configure a Twilio phone number, create a virtual environment with Python packages, and set up an ngrok tunnel to expose the Flask application to the public internet. The chatbot can be tested by sending SMS messages to the configured Twilio number, and its responses will trigger third-party APIs for quote and cat content. For production deployment, developers should consider using robust web servers like gunicorn or uWSGI and running the service on a cloud server instead of their local machine.