How to setup Huawei E3372h-607 with NCM LTE

Installing and Using OpenWrt Network and Wireless Configuration
16

Possibly a long-shot, but try adding the dialnum option to the interface; i.e:

config interface 'LTE'
        option mode 'preferlte'
        option apn 'ctlte'
        option dialnum '*99#'
        option proto 'ncm'
        option ifname 'wwan0'
        option device '/dev/ttyUSB0'
        option ipv6 'auto'
        option metric '40'
        option delegate '0'
        option disabled '0'

you might also add option delay '30', but I don't think it's really necessary with the E3372.

After you made any edits, make sure to do:

uci commit /etc/config/network
service network restart
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