Amazon.com: 4G VPN Router, Industrial Dual Sim 4G LTE WiFi Router 3G/4G Yeacomm YF325 Wireless Modem Router Unlocked with Sim Card Slot, External Antenna Cellular Modem in North/South America, NOT for Verizon :
R340 Series Car Wifi Dual Sim 4g Lte Router With Sim Card Slot And External Sma Antenna - 3g/4g Routers - AliExpress
Amazon.com: KuWFi 4G Router with SIM Card Slot Unlocked, 1200Mbps LTE Router Dual Band Gigabit Cellular Router with External Antenna, EC25-AF Module Support DDNS/VPN/QoS, Up to 64 Users[with 1G LTE Data SIM