A system allowing agents to send and receive SMS messages, particularly for OTP codes, using an old Android phone and a relay server, as an alternative to services like Twilio.

This solution directly addresses the cost and complexity associated with commercial SMS APIs for agent-based systems. By repurposing an old Android phone and a simple relay server, it provides a highly cost-effective mechanism for agents to access OTP codes and send SMS messages. This is particularly relevant for internal tools, testing environments, or niche applications where Twilio's pricing or setup overhead is prohibitive. The ability to self-host on a low-cost VPS offers significant operational flexibility and cost control. While not a scalable enterprise solution in its current form, it highlights a market demand for pragmatic, low-cost communication channels for automated systems, especially for two-factor authentication bypass or internal notification systems. This could evolve into a more robust, open-source alternative for specific use cases.