ModemManager Can't Find Mobile Broadband: ZTE MF79U on Debian 11
If you're having trouble connecting to the internet using a ZTE MF79U mobile broadband dongle on Debian 11, it's possible that ModemManager, the service that manages modem devices in Linux, is unable to detect the device. In this article, we'll cover the key concepts related to this issue and provide a detailed guide on how to troubleshoot and resolve it.
Understanding the Issue
The ZTE MF79U is a mobile broadband dongle that can be used to connect to the internet using a cellular network. In Linux, devices like this are typically managed by the ModemManager service. However, in some cases, ModemManager may not be able to detect the ZTE MF79U, preventing you from connecting to the internet.
Checking if ModemManager Can Detect the Device
To check if ModemManager can detect the ZTE MF79U, open a terminal and run the following command:
mmcli -L
This will list all the modem devices that ModemManager can detect. If the ZTE MF79U is not listed, it's likely that ModemManager is not able to detect the device.
Resolving the Issue
If ModemManager is unable to detect the ZTE MF79U, there are a few things you can try to resolve the issue:
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Make sure the dongle is properly connected to the computer. Try using a different USB port or a different computer to rule out any issues with the port or the computer.
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Check if the device is properly configured. Make sure that the SIM card is inserted correctly and that it is activated. You can also try using a different SIM card to rule out any issues with the card.
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Install the necessary drivers. In some cases, the ZTE MF79U may require additional drivers to be installed in order for it to be detected by ModemManager. You can try installing the
usb-modeswitchandusb-modeswitch-datapackages, which are known to work with the ZTE MF79U. -
Try using a different modem management tool. If ModemManager is still unable to detect the ZTE MF79U, you can try using a different modem management tool, such as
sakis3gorwvdial.
In this article, we covered the issue of ModemManager not being able to detect the ZTE MF79U mobile broadband dongle on Debian 11. We provided a detailed guide on how to troubleshoot and resolve this issue, including checking if ModemManager can detect the device, making sure the dongle is properly connected and configured, installing the necessary drivers, and trying a different modem management tool.