The SAMSUNG CDMA Modem Diagnostic Serial Port (WDM) driver is a software component that enables your Windows computer to communicate with a Samsung CDMA (Code Division Multiple Access) modem device. CDMA modems are often used for mobile broadband connections or for establishing a dial-up connection to the internet via cellular networks. This driver allows the system to interact with the device for diagnostic purposes and may also be required for data or voice calls, depending on the specific modem model.