On Tomato Firmware 1.28.0000 MIPSR2-101 K26 USB Mega-VPN-64K Shibby there is an option to use USB 3G Modem Support. However, I was interested in getting a Unlocked Sierra Wireless AirCard 313U which has 4G LTE capability and sticking a 4G LTE unlimited data SIM card in that. I plan to do this on a Asus RT-N66U router using one of the two USB ports. I would think I could just plug in the Unlocked Sierra Wireless AirCard 313U, activate that USB Port as my WAN in the VLAN settings and away I go. Is it that simple or more complicated? Any help is always appreciated.