ZTE MF667: autodetection sets wrong primary ttyUSB port
ZTE MF667 vid:pid 19d2:1268
Although signal strength and network name are shown by NetworkManager, it's not possible to make a connection. ModemManager debug output shows ttyUSB2 selected as primary port.
The connection is possible enforcing ttyUSB3 as the primary port by adding the following lines to /lib/udev/rules.d/77-mm-zte-port-types.rules
ATTRS{idVendor}=="19d2", ATTRS{idProduct}=="1268", ENV{.MM_USBIFNUM}=="03", ENV{ID_MM_PORT_TYPE_AT_PRIMARY}="1"
ATTRS{idVendor}=="19d2", ATTRS{idProduct}=="1268", ENV{.MM_USBIFNUM}=="01", ENV{ID_MM_PORT_TYPE_AT_SECONDARY}="1"