What's odd is that this is a huawei modem, not an option modem, so one would
expect it to work better with usb_modeswitch and it's -H (huawei) mode - but
that's not the case, I've tested that as well.
https://launchpad.net/bugs/401655
ATTRS{idVendor}=="0af0", ATTRS{idProduct}=="7501", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"
ATTRS{idVendor}=="0af0", ATTRS{idProduct}=="7601", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"
ATTRS{idVendor}=="0af0", ATTRS{idProduct}=="7901", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"
+ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1446", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"
LABEL="option_zerocd_end"