Product Overview
The LILYGO TTGO T-Call V1.3 ESP32 Wireless GPRS Antenna SIM Card SIM800L Module is a compact, dual‑mode communication board that merges the high‑performance ESP32 microcontroller with a SIM800L GSM/GPRS transceiver. Designed for Arduino‑compatible development, this board delivers seamless Wi‑Fi and 2G cellular connectivity, an integrated SIM‑card slot, and an external antenna for reliable signal reception, making it ideal for remote‑monitoring, data‑logging, and mobile communication projects.

Key Specifications

• Microcontroller: ESP32‑S2 dual‑core, 240 MHz, 520 KB SRAM


• Cellular Modem: SIM800L GSM/GPRS, quad‑band 850/900/1800/1900 MHz


• SIM Support: Micro‑SIM (2 × 3.5 mm) slot, hot‑swap capable


• Wireless Interfaces: Wi‑Fi 802.11 b/g/n, Bluetooth 4.2 BLE


• Antenna: External SMA connector with 5 dBi gain antenna included


• Power Supply: 5 V via USB‑C, 3.3 V regulator for ESP32 and SIM800L


• I/O Expansion: 34 GPIO pins, SPI, I²C, UART, ADC, DAC, PWM


• Memory: 4 MB Flash (SPI‑NOR), optional external SD‑card slot


• Operating Temperature: -40 °C to 85 °C


• Dimensions: 55 mm × 27 mm × 6 mm

Typical Applications

• Remote environmental monitoring with sensor arrays (e.g., DHT22 temperature/humidity)


• IoT data loggers transmitting over GPRS when Wi‑Fi is unavailable


• SMS/voice alert systems for security and automation


• Fleet tracking and telematics using cellular networks


• Portable weather stations with real‑time cloud updates


• Smart agriculture solutions requiring low‑power cellular connectivity


• Emergency communication devices for disaster‑prone areas