I've never had any success using this dongle in any KDE environments. It works fine in Windows and Linux Mint,ubutu,opensuse and several others running gnome desktops.
I have no idea if KDE is the problem, I am certainly no linux expert.
When plugged in it shows up in network manager but when clicked on it comes up with the following error.
Unable to open device /dev/ttyHS0
After searching around this forum and google a few people had suggested creating a symbolic link to point at one of the other HS* entries.
I have tried ttyHS0,ttyHS1,ttyHS2 and ttyHS3. all of them allow me to enter configuration settings in network manager, but none of them connect. They all find the network as Orange and the light on the dongle goes from flashing to a steady light, which usually means it's connected, but no joy. I know the APN,user,pass are correct as they work everywhere else.
Utmsmon does not see the modem at all.
I have also tried installing Sakis3G, but that does the same as network manager. It finds the modem but fails to connect.
The dongle has a microSD card slot, I have tried it with the card in and the card out, same result.
This dongle has been out now for a few years so there must be a solution by now. I really want to give PCLOS a whirl but without Internet it's next to useless for me.
I am hoping there is a simple solution to this as like I said I am no linux expert, so if any kind soul decides to help, step by step instructions would be greatly appreciated.