User Guide
Use the QMI protocol
Select device as /dev/cdc-wdmX and fill in the correct APN.
Use PPPD dial
Select device as /dev/ttyUSBX and fill in the correct APN. X is a number, and
in general, select the port with the largest value.
For MIFI,E750,X750,X300B, select ttyUSB3.
For XE300 and AP1300, select ttyUSB4.