Serial communication ESP32 with 3G SARA ublox 201 - Networking, Protocols, and Devices - Arduino Forum
RS485 Multi-level Networking Modem, Suporta Protocolo Múltiplo, ESP32 ESP32-S3 Chip, 470 a 490MHz, 863 a 883MHz, 902 a 922MHz - AliExpress
Petr Kracik on X: "Second version of #ESP32 retro modem emulator. Now with AUX connector with full I2C/SPI or 6 GPIO for different use-cases other than modem. Also come with modern USB
Walter - ESP32-S3 5G IoT module
ESP32 board with 150Mbps 4G LTE modem also supports RS485, CAN Bus, and relay expansion - CNX Software
ESP32 Power Mode – Phatiphat Thounthong
arduino)esp32 Cam Modem Wifi(enc) - Centro Eletrônico Uberlândia
New Part Day: The $15 ESP32 With Cellular | Hackaday