Biggest Lithuanian operators sell another Huawei E3131 stick variant - ATTR{idProduct}=="15ca" (see https://usb-ids.gowdy.us/read/UD/12d1/15ca )

Please support this USB modem - add this line to 40-usb_modeswitch.rules

ATTR{idVendor}=="12d1", ATTR{idProduct}=="15ca", RUN+="usb_modeswitch '%b/%k'"

Also add attached file to usb_modeswitch.d folder (contains the lines bellow):

# Huawei E3131 (Variant)
TargetVendor= 0x12d1
TargetProductList="1506"
MessageContent="55534243123456780000000000000011062000000100000000000000000000"

The same file is also available at https://launchpadlibrarian.net/171448931/12d1%3A15ca
This configuration works fine - see https://bugs.launchpad.net/ubuntu/+sour ... comments/2
(additionally I've tested by myself).

Thanks for the hint! This will go into the next data package release.

The data on Ubuntu 12.04 is very old though. A lot of newer modems are not included ...