Show HN: Let agents send/receive SMS using your old Android phone (simlink.snaz.cz)

A new open-source project has emerged that allows AI agents to send and receive SMS messages using old Android phones. Dubbed SimLink, this self-hostable server utilizes a prepaid SIM card controlled by the user and operates over the Model Context Protocol (MCP). Its significance lies in providing AI developers with a straightforward, cost-effective solution for enabling real phone number capabilities for their agents, without incurring subscription fees or complex infrastructure requirements. SimLink enhances privacy by only holding messages long enough to relay them between the agent and the phone, ensuring encryption both in transit and at rest; message bodies are never logged. The system supports functions like sending and fetching messages, while allowing users to deploy it on any spare Android device they have. This makes it not only accessible but also customizable for developers looking to integrate SMS functionalities into their AI applications seamlessly.