Comment 4 for bug 401655

Just as you say, this rule looks very much like the rule in 61-option-modem-modeswitch.rules, and removing my /etc/udev/rules.d/15-huawei-e1551.rules then adding this line to 61-option-modem-modeswitch.rules:

ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1446", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"

..also makes the modem work as intended (rebooted after udev rulechange to be sure I got the new rules).

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.

Hope that gave you the answer to your question?