In my last post i was struggling to get this modem to work. I have now found what the problem is – it has to do with the so-called ZeroCD device. What this means is that these devices have the windows drivers already “inserted” into them, so that when it is plugged into a windows OS it automatically installs the drivers by itself.
The problem is that for linux distros this is recognized as the “first device”, meaning a mountable filesystem with drivers already on it. And since those drivers are for windows the device never “changes status”. So two things need to be done :
1 – Install a program called “usb_modeswitch”
2 – Modify its usb_modeswitch.conf file
If you want to keep it simple and own a ZTE 622 device (others may/probably have different config) you can have it like this :
DefaultVendor= 0x19d2
DefaultProduct= 0×2000TargetVendor= 0x19d2
TargetProduct= 0×0001DetachStorageOnly=1
This way all you need to do when you insert your ZTE Modem is unmount it, run “usb_modeswitch” and start the connection via network manager. Simple enough when you know how 
))
