ZTE Modem not working on Ubuntu 18.04

Question

I have run the command lsusb and got the following code:

Bus 001 Device 002: ID 8087:8000 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 005: ID 8087:07dc Intel Corp. 
Bus 002 Device 004: ID 5986:055d Acer, Inc 
Bus 002 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 002 Device 014: ID 09da:c10a A4Tech Co., Ltd. 
Bus 002 Device 028: ID 19d2:2003 ZTE WCDMA Technologies MSM 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

It shows the Modem but I can not find it on the network section, even after unmount the 'ZTE USB SCSI CD-ROM (2.31)' device from the disk. What should I do? Or, Can anyone tell me the process of installing modem handler like Windows OS ?

Answer 1

I had similar problem with modem ZTE MF112 produced for Russian mobile provider MTS. In Ubuntu 15.10 and in Ubuntu 16.04 LTS it is recognized as 19d2:2003 ZTE WCDMA Technologies MSM. Now I have partially solved my problem with it. It connects to mobile network and provides Internet, but sometimes it is necessary to unplug and again plug the modem three times for the system to see it. Try to take the following steps:

1. Install the usb-modeswitch package if it is not already installed.
2. In the folder /usr/share/usb_modeswitch create a text document with the name 19d2:2000. Its content should be

   # ZTE devices
   ReleaseDelay=9000
   ReleaseDelay=9000
   TargetVendor= 0x19d2
   TargetProductList="0001,0002,0015,0016,0017,0019,0031,0033,0037,0042,0052,0055,0061,0063,0064,0066,0091,0108,0117,0128,0151,0157,0177,1402,2002,2003"
   StandardEject=1
   MessageContent="55534243123456782000000080000c85010101180101010101000000000000"

3. Edit the file /etc/usb_modeswitch.conf and set the option SetStorageDelay=6 in it. You can also uncomment the line EnableLogging=1 and then you will see the log file /var/log/usb_modeswitch.log with modem errors if they occur.