# dmesg | grep GSM
[  123.793151] USB Serial support registered for GSM modem (1-port)
[  123.793426] option 1-1.1.1:1.0: GSM modem (1-port) converter detected
[  123.794525] usb 1-1.1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  123.794647] option 1-1.1.1:1.1: GSM modem (1-port) converter detected
[  123.797088] usb 1-1.1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  123.797241] option 1-1.1.1:1.3: GSM modem (1-port) converter detected
[  123.798522] usb 1-1.1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  123.803405] option: v0.7.2:USB Driver for GSM modems
# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 004: ID 09da:000a A4 Tech Co., Ltd Port Mouse
Bus 001 Device 005: ID 03f0:0024 Hewlett-Packard KU-0316 Keyboard
Bus 001 Device 006: ID 19d2:0031 ONDA Communication S.p.A.
Bus 001 Device 007: ID 0930:6544 Toshiba Corp. Kingston DataTraveler 2.0 Stick )
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub