I want tell you:
One 3g modem is a option 225 when you do lsusb it’s this one:
Bus 001 Device 003: ID 0af0:6971, to create the ttyUSB0,1,2, the command is modprobe usbserial vendor=0x0af0 product=0x6971
The other is a XS Stick W12 4G, the lsusb is:
Bus 001 Device 002: ID 16d8:6006
After I make the command modprobe usbserial vendor=0x16d8 product=0x6006, but no more ttyUSB are create.
If I make the command first for the XS Stick, the ttyUSB are create.
With that I can say for the two modem, they are see for the system as really modem.