Amazon.com: USR-G771-E RS232/RS485 to LTE CAT 1 Cellular Modem Support LTE and GSM TCP UDP Transparent Transmission with SIM Card Support HTTP, MQTT, SMS (Modbus RTU to TCP Version NO Adapter) :
Modem Router 4G LTE GSM Unlocked ZTE MF253 Tmobile Claro Latin America Hotspot | eBay