First, I think both of you is using EC20.
Second, about the config. Now in Internet settings, you can choose 3G tab, then choose country, service provider, ttyUSB3, UMTS and then click submit.
In firmware v2.23-6, the Mifi will use QMI mode, that is to say, the ttyUSB3 is actually not useful. You also can get information using “uqmi -d /dev/cdc-wdm0 –get-signal-info” to get signal information. But there is still no information about how the modem uses 3G or 4G mode to connect.
In early firmwares, the Mifi will use serial mode, that is to say, using ttyUSB3 to communicate. “umqi” actually cannot work. You have to use AT command to get information.
How the modem choose serial or qmi? Openwrt does the work if you use “wwan” as the protocol. We added EC20’s QMI driver and configuration to the firmware so firmware v2.23-6 can choose QMI mode automatically.
Why not let users choose QMI or serial, or adjust the UI depends on the protocol? Two reasons: (1) difficult to change the UI; (2) This even confuse the users more. We are thinking how to make this simper. Actually these things can be fully automatically. But this programming is more difficult.
Why @RangerZ has slower Internet connections and how to correct this? I actually have no idea now.