TTGO T-Call ESP32 SIM800L
SIMCom Wireless
TTGO T-Call ESP32 SIM800L Development Board by SIMCom Wireless: datasheet PDF, pinout and specifications.
ESP32 & ESP8266 Boards
SIMCom Wireless Solutions is a Shanghai-based maker of cellular IoT modules. Its SIM800, SIM900 and SIM7600 GSM, LTE and GNSS modules are widely used in trackers, telemetry and maker projects.

TTGO T-Call ESP32 SIM800L Development Board by SIMCom Wireless: datasheet PDF, pinout and specifications.