gsm and 3G shields tutorial :: mobile IoT hardware - j-328GSM3GLader Arduino Pro Mini [adapter board] and c-uGSM / d-u3G / h-nanoGSM shields howto start tutorial - part 2- by DRAGOS IOSUB
USB Modem to Ethernet shield - Project Guidance - Arduino Forum
Soracom 2G/3G IoT Connectivity Kit (powered by Arduino) | Soracom
Vodafone USB 3G Modem Driver From Mbed | Hackaday
arduino / USB modem talking. OpenWRT Project - YouTube