I'm having hard time to make the UC20 module working. Does anyone have any success on communicating through this device? I try it with the in-tree QMI/wwan driver. The USB devices are there, but the module doesn't connect.
Please note, that I have the EC25 working with a custom kernel patch.
I think it would be helpful if you are more specific about the version of the EC20, your device, country, carrier and settings.
I have an EC20A and was never able to get it to work in the US on AT&T. I occasionally had an IP, but it was unstable and to slow to use. It was at least 6 months ago and I do not have the config any more.