2UUL SM01 Dual SIM Checker Card is a specialized quick test board designed to diagnose SIM slot and signal line issues in mobile phones with speed and accuracy. It simulates the presence of SIM cards to help technicians quickly detect SIM card circuit faults, poor contact, or damaged signal lines without inserting an actual SIM. With support for dual SIM detection, it is compatible with a wide range of Android and iPhone models. Its plug-and-play design ensures fast diagnostics, making it an essential tool for mobile repair shops. This compact, durable tester is perfect for improving troubleshooting efficiency and reducing repair time.