Hi There,
Recently our project need to use EC20 4G Module for data link. The links of the module provide some instructions to use it in Linux. But still lost some information.We didn’t make it work yet, those information just for your reference.
Module Spec
Way to add USB Driver
http://wiki.openwrt.org/doc/howtobuild/wireless-router-with-a-3g-dongle
Config File