I faced the same problem and unable to get a solution...if you don't get an answer to this in here post your problem in a foss thread... someone might help you
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meka kde wala thiyena plasma network manager widget eke well known bug ekak.
wvdial use karanna
> sudo apt-get install wvdial
> sudo vi /etc/wvdial.conf (get a sample for ISP provider from the web)
inserted the usb internet modem
> sudo wvdial
that's it.