After recent update NetworkManager started refusing to recognize my mobile broadband modem. After some investigating, I've found that it uses 'modem probing' for capabilities of the device. It looked like this in logs:
May 12 20:38:43 localhost NetworkManager: <info> (ttyUSB0): found serial port (udev: hal:CDMA)
May 12 20:38:43 localhost NetworkManager: <info> (ttyUSB0): ignoring due to lack of probed mobile broadband capabilties
The probing rules are described in file /lib/udev/rules.d/77-nm-probe-modem-capabilities.rules
, but it is searched in /etc/udev/rules.d/77-nm-probe-modem-capabilities.rules
Creating symbolic link should do as a workaround.