Thank you for your suggestions.
Here is the last part (the part about the usb device) of /var/log/syslog:
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Oct 18 21:35:17 localhost kernel: [ 388.226936] usb 1-1.3: new high-speed USB device number 4 using ehci_hcd
Oct 18 21:35:17 localhost mtp-probe: checking bus 1, device 4: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3"
Oct 18 21:35:17 localhost mtp-probe: bus: 1, device: 4 was not an MTP device
Oct 18 21:35:17 localhost kernel: [ 388.338315] usb 1-1.3: New USB device found, idVendor=12d1, idProduct=14fe
Oct 18 21:35:17 localhost kernel: [ 388.338321] usb 1-1.3: New USB device strings: Mfr=2, Product=1, SerialNumber=0
Oct 18 21:35:17 localhost kernel: [ 388.338326] usb 1-1.3: Product: HUAWEI Mobile
Oct 18 21:35:17 localhost kernel: [ 388.338329] usb 1-1.3: Manufacturer: HUAWEI
Oct 18 21:35:17 localhost kernel: [ 388.340252] scsi7 : usb-storage 1-1.3:1.0
Oct 18 21:35:17 localhost kernel: [ 388.340625] scsi8 : usb-storage 1-1.3:1.1
Oct 18 21:35:18 localhost usb_modeswitch: switching device 12d1:14fe on 001/004
Oct 18 21:35:18 localhost kernel: [ 389.019892] usb 1-1.3: USB disconnect, device number 4
Oct 18 21:35:24 localhost kernel: [ 395.146935] usb 1-1.3: new high-speed USB device number 5 using ehci_hcd
Oct 18 21:35:24 localhost mtp-probe: checking bus 1, device 5: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3"
Oct 18 21:35:24 localhost mtp-probe: bus: 1, device: 5 was not an MTP device
Oct 18 21:35:24 localhost kernel: [ 395.258565] usb 1-1.3: New USB device found, idVendor=12d1, idProduct=1506
Oct 18 21:35:24 localhost kernel: [ 395.258571] usb 1-1.3: New USB device strings: Mfr=3, Product=2, SerialNumber=0
Oct 18 21:35:24 localhost kernel: [ 395.258576] usb 1-1.3: Product: HUAWEI Mobile
Oct 18 21:35:24 localhost kernel: [ 395.258579] usb 1-1.3: Manufacturer: HUAWEI
Oct 18 21:35:24 localhost kernel: [ 395.260965] scsi9 : usb-storage 1-1.3:1.4
Oct 18 21:35:24 localhost kernel: [ 395.261314] scsi10 : usb-storage 1-1.3:1.5
Oct 18 21:35:24 localhost kernel: [ 395.314793] usbcore: registered new interface driver usbserial
Oct 18 21:35:24 localhost kernel: [ 395.314825] USB Serial support registered for generic
Oct 18 21:35:24 localhost kernel: [ 395.314915] usbcore: registered new interface driver usbserial_generic
Oct 18 21:35:24 localhost kernel: [ 395.314920] usbserial: USB Serial Driver core
Oct 18 21:35:24 localhost kernel: [ 395.330480] USB Serial support registered for GSM modem (1-port)
Oct 18 21:35:24 localhost kernel: [ 395.330538] option 1-1.3:1.0: GSM modem (1-port) converter detected
Oct 18 21:35:24 localhost kernel: [ 395.330656] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
Oct 18 21:35:24 localhost kernel: [ 395.330713] option 1-1.3:1.2: GSM modem (1-port) converter detected
Oct 18 21:35:24 localhost kernel: [ 395.330821] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
Oct 18 21:35:24 localhost kernel: [ 395.330856] option 1-1.3:1.3: GSM modem (1-port) converter detected
Oct 18 21:35:24 localhost kernel: [ 395.331041] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
Oct 18 21:35:24 localhost kernel: [ 395.331116] usbcore: registered new interface driver option
Oct 18 21:35:24 localhost kernel: [ 395.331120] option: v0.7.2:USB Driver for GSM modems
Oct 18 21:35:24 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) opening serial port...
Oct 18 21:35:24 localhost modem-manager[802]: <info> (ttyUSB0) opening serial port...
Oct 18 21:35:25 localhost logger: usb_modeswitch: switched to 12d1:1506 on 001/005
Oct 18 21:35:25 localhost kernel: [ 396.257807] scsi 10:0:0:0: Direct-Access HUAWEI SD Storage 2.31 PQ: 0 ANSI: 2
Oct 18 21:35:25 localhost kernel: [ 396.258136] scsi 9:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2
Oct 18 21:35:25 localhost kernel: [ 396.260378] sd 10:0:0:0: [sdc] Attached SCSI removable disk
Oct 18 21:35:25 localhost kernel: [ 396.260733] sr1: scsi-1 drive
Oct 18 21:35:25 localhost kernel: [ 396.261164] sr 9:0:0:0: Attached scsi CD-ROM sr1
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) closing serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB0) closing serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB0) serial port closed
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) serial port closed
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) opening serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB0) opening serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB0
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB0
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) closing serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB0) closing serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB0) serial port closed
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB0) serial port closed
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB1) opening serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB1) opening serial port...
Oct 18 21:35:27 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB2) opening serial port...
Oct 18 21:35:27 localhost modem-manager[802]: <info> (ttyUSB2) opening serial port...
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB1) closing serial port...
Oct 18 21:35:34 localhost modem-manager[802]: <info> (ttyUSB1) closing serial port...
Oct 18 21:35:34 localhost modem-manager[802]: <info> (ttyUSB1) serial port closed
Oct 18 21:35:34 localhost modem-manager[802]: <info> (ttyUSB2) closing serial port...
Oct 18 21:35:34 localhost modem-manager[802]: <info> (ttyUSB2) serial port closed
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB1) serial port closed
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB2) closing serial port...
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (ttyUSB2) serial port closed
Oct 18 21:35:34 localhost modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB1
Oct 18 21:35:34 localhost modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB2
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB1
Oct 18 21:35:34 localhost dbus-daemon[768]: modem-manager[802]: <info> (Huawei): GSM modem /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3 claimed port ttyUSB2
Oct 18 21:35:34 localhost NetworkManager[753]: <warn> (ttyUSB0): failed to look up interface index
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): new GSM/UMTS device (driver: 'option1' ifindex: 0)
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): exported as /org/freedesktop/NetworkManager/Devices/1
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): now managed
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): deactivating device (reason 'managed') [2]
Oct 18 21:35:34 localhost NetworkManager[753]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
Oct 18 21:35:34 localhost NetworkManager[753]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed
Oct 18 21:35:34 localhost NetworkManager[753]: <info> (ttyUSB0): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
dmesg gives a similar output. I can't see where it is mapped.
I also tried what doctor5000 suggested.
comgt -d /dev/ttyUSB* ---> no output. I had to quit the console.
comgt -d /dev/ttyUSB0 gives:
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Enter PIN number: 3547
Waiting for Registration..(120 sec max)..
Registered on Home network:
Failed to register
comgt -d /dev/ttyUSB1 gives:
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***SIM ERROR***
Check device port configuration.
Check SIM is inserted
Test SIM in a mobile phone?
comgt -d /dev/ttyUSB2 gives:
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SIM ready
Waiting for Registration..(120 sec max)
Registered on Home network:
Failed to register
comgt gives:
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Trying list of devices
SIM ready
Waiting for Registration..(120 sec max)
Registered on Home network:
Failed to register
I can't say that I understand much from the above outputs.
Is that helpful to you?
Thanks.