OpenWRT with 3G/UMTS USB dongle Nokia CS15 on TP-LINK WR703N

Install packages:

opkg install comgt kmod-usb2 kmod-usb-ohci kmod-usb-uhci kmod-usb-serial kmod-usb-serial-option kmod-usb-serial-wwan kmod-usb-acm usb-modeswitch usb-modeswitch-data luci-proto-3g

Edit /etc/config/network and add 3g UWAN (UMTS WAN) interface:

config interface 'uwan'
 option ifname 'ppp0'
 option pincode 'XXXX'
 option service 'umts'
 option proto '3g'
 option device '/dev/ttyACM0'
 option apn 'YOUR.APN'
 option pppd_options 'debug user "" password "" noipdefault refuse-chap refuse-mschap refuse-mschap-v2 refuse-eap'

Then start interface with:

ifup uwan

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