SimRelay is a Chrome extension designed to enhance testing for development and QA teams by connecting browsers to a shared pool of physical SIM cards. This tool eliminates the hassle of passing physical devices around the office, allowing teams to perform SMS-based testing efficiently. Key features include a live view of available SIM cards, the ability to lock and unlock SIMs for individual use, and real-time synchronization with team members. Additionally, it offers automatic filling of SMS codes directly into web forms, which speeds up the testing process significantly.

The extension supports various testing scenarios, including Two-Factor Authentication (2FA), SMS-based user verification, and mobile payment gateways. With features like quick copying of phone numbers and a countdown timer for locked SIMs, SimRelay ensures streamlined communication and collaboration within teams. This makes it an essential tool for any project that requires interaction with real phone numbers.