HSPA Mobile Connect AT Device (COM4) Driver

The HSPA Mobile Connect AT Device (COM4) driver lets Windows communicate with the AT-command interface of a compatible Hspa USB mobile broadband device. It is needed when setting up the modem, restoring a missing serial port, or troubleshooting connection software that cannot detect the device.

This interface handles modem control commands rather than acting as the entire mobile broadband connection on its own. The COM4 label identifies its assigned serial port; Windows may assign a different port number after reconnection or installation on another computer.

Key Features

• Enables compatible applications to send AT commands for modem identification, status checks, and connection control.
• Provides the serial-port interface used by supported mobile broadband software to communicate with the USB modem.
• Helps Windows recognize the AT interface when the appropriate driver is missing or incorrectly installed.
• Supports setup on Windows 10, 8.1, 7, Vista, and XP when you select a package matching your device and system architecture.

How to Install HSPA Mobile Connect AT Device (COM4) Driver

1. Check your device and Windows version. Open Device Manager and locate the modem interface under Ports (COM & LPT) or Other devices. Check its hardware IDs in Properties > Details, and confirm whether your Windows installation is 32-bit or 64-bit.
2. Choose a matching package. Before starting the HSPA Mobile Connect AT Device (COM4) driver download for Windows, verify the hardware IDs and supported operating systems. Select the latest version compatible with your hardware, not simply the newest package available.
3. Download and extract the files. Use a trusted free download source and scan the package before opening it. Extract compressed files to an accessible folder.
4. Install the driver. Run the supplied installer, or right-click the device in Device Manager, select Update driver, and browse to the extracted folder. Follow the prompts without bypassing driver-signature warnings.
5. Verify detection. Restart if prompted, reconnect the modem, and check that the AT interface appears without a warning icon. If your connection software requires a port selection, choose the COM number currently shown in Device Manager.

Keep the driver updated when a compatible release addresses a problem you experience. For Windows 10/11 searches, note that Windows 10 is listed as supported here, but Windows 11 compatibility is not confirmed. Before any update, retain a working driver package so you can roll back if necessary.