Uninstall Huawei Software on Mac

The drivers / software for my USB modem have an uninstaller in ~/Library/Application Support/com.birdstep.saunalahti/tools/uninstall_drivers.

If you don't find any uninstaller, it's safe to just remove the kext bundles. They will stay loaded until you restart.

sudo rm -r /System/Library/Extensions/HuaweiDataCardDriver.kext/ /System/Library/Extensions/USBExpressCardCantWake_Huawei.kext/

There might also be a launchd plist in {~,}/Library/Launch{Agents,Daemons}/ that starts a background program. Like I have ~/Library/LaunchAgents/com.birdstep.saunalahti.autolaunch.plist, which starts ~/Library/Application Support/com.birdstep.saunalahti/tools/autolaunch. The plist can also just be deleted normally.