Twilio's Developer Advocacy team has introduced the Twilio Dev Phone, a Twilio CLI plugin that enables developers to send and receive calls and SMS directly from their local development environment. The tool is designed to help overcome issues related to personal cell phones being a blocker to Twilio development, such as lack of cell service or phone number availability in certain countries. With the Dev Phone, developers can configure a phone number, send messages, make outbound calls, and receive inbound calls and SMS without needing their personal device. The tool is fully open source and allows for contributions, making it easy for developers to get started and provide feedback.