The latest BIOS update for T450s contains:
* (Fix) Fixed an issue related to WWAN lost when USB3.0 enabled.

http://support.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-t
-series-laptops/thinkpad-t450s/downloads/ds102109

I haven't updated my bios yet, but I tried to disable USB 3.0.
Unfortunately it did not help much. Card appears randomly after reboot
and removing modules does not help.

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https://bugs.launchpad.net/bugs/1440032

Title:
  nm-applet is missing the Sierra EM7345 4G LTE

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