at "https://raw.githubusercontent.com/pictux/Yun_3g/master/linino_set3g.sh"
/bin/opkg install unzip kmod-usb2 kmod-usb-core kmod-usb-serial kmod-usb-serial-option kmod-usb-serial-wwan usb-modeswitch usb-modeswitch-data libusb-1.0 comgt chat
wait
If you run it at Yun, then package is from "http://downloads.arduino.cc/openwrtyun/", the reason that script use https://raw.githubusercontent.com/ to install package luci-proto-3g is script wrote for linino which does not have luci-proto-3g.
It will work when kernel version match but break once not.