WCDMA 3G PC UI Port (COM3) Driver

The WCDMA 3G PC UI Port (COM3) driver enables Windows to communicate with the USB serial interface exposed by a compatible Qualcomm Atheros-based 3G modem. It is intended for users whose modem interface appears as an unknown device, shows a warning in Device Manager, or cannot communicate with compatible modem-management software.

Key Features

• USB serial communication: Provides access to the modem’s PC UI interface, which compatible utilities may use for control commands and status information.
• Device recognition: Helps Windows identify the WCDMA 3G PC UI Port and assign it a COM port. Although listed here as COM3, the assigned port number may differ on your computer.
• Legacy Windows support: Intended for Windows 10, 8.1, 7, Vista, and XP, subject to the specific driver package and hardware revision.
• Management software access: Allows compatible applications to communicate with the PC UI interface. Separate drivers or software may be needed for mobile broadband connectivity.

How to Install WCDMA 3G PC UI Port (COM3) Driver

1. Check your device and system. Open Device Manager, locate the modem interface, and check its hardware IDs under Properties > Details. Confirm your Windows version and whether it is 32-bit or 64-bit.
2. Choose a compatible package. Before starting your WCDMA 3G PC UI Port (COM3) driver download for Windows, match the package to your hardware IDs and operating system. Select the latest version explicitly compatible with your device; Windows 10/11 compatibility should not be assumed, as Windows 11 is not listed among the supported systems.
3. Download and extract the files. If a free download is offered, verify its source and scan the package before opening it. Extract compressed files to an accessible folder.
4. Install the driver. Run the supplied installer, if available, or right-click the device in Device Manager and choose Update driver. Select the option to browse your computer, then point Windows to the extracted driver folder.
5. Reconnect and verify. Restart if prompted, reconnect the modem, and check Device Manager for warning icons. If your modem utility requires a port selection, choose the COM number Windows has assigned.

Keep the driver updated when a compatible release addresses a connection issue or improves stability. Before an update, retain the working installer or create a restore point so you can recover if needed. Avoid replacing a stable driver solely because another package has a higher version number.