# LILYGO T-Call V1.4

> ESP32 development board with SIM800L 2G GSM/GPRS cellular modem, Wi-Fi, Bluetooth 4.2, USB-C charging, and Li-Po battery connector for IoT devices requiring SMS and GPRS data connectivity.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** ESP32
- **Price:** ~$16.51
- **Product Readiness:** developer
- **CPU:** ESP32
- **CPU Architecture:** Xtensa LX6 dual-core
- **PSRAM:** 8MB
- **Flash:** 4MB
- **USB:** USB-C
- **Power:** 5V + LiPo
- **Operating Voltage:** 3.3V
- **Battery:** LiPo (user-supplied, 1.25mm JST)
- **Charging Port:** USB-C

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 4.2
- **Cellular:** 2G GSM/GPRS

## Open Source

- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Compatible Firmware

arduino, esp-idf, platformio

## Use Cases

- cellular-iot
- sms-alerts
- remote-monitoring
- asset-tracking
- gsm-data-logger

## Components

- **ESP32** (mcu): Dual-core Xtensa LX6 at 240MHz with Wi-Fi b/g/n and Bluetooth 4.2 BR/EDR+BLE — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)
- **SIM800L** (cellular-modem): Quad-band 2G GSM/GPRS modem supporting SMS, voice calls, and GPRS data — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsimcom.ee%2Fdocuments%2FSIM800%2FSIM800_Hardware_Design_V1.09.pdf&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)
- **IP5306** (battery-charger): Li-Po battery charging and power path management IC — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdatasheet.lcsc.com%2Fszlcsc%2FIP5306_C181692.pdf&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)
- **CH9102** (usb-serial): CH9102 USB to UART bridge chip for programming — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.wch-ic.com%2Fproducts%2FCH9102.html&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)

## Protocols

- **UART**
- **SPI**
- **I2C**
- **SDIO**
- **I2S**

## Available Software

- **[Arduino IDE](https://openhardware.directory/r?to=https%3A%2F%2Fwww.arduino.cc%2F&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)**

## Description

## Overview

The LILYGO T-Call V1.4 pairs an ESP32 microcontroller with a SIM800L 2G GSM/GPRS modem for cellular communication in regions with 2G coverage. It provides SMS messaging, voice call capability (with microphone/speaker pin extension), and GPRS data connectivity alongside the ESP32's Wi-Fi and Bluetooth 4.2. The board includes a USB-C port for programming and charging, a JST PH 2-pin connector for a Li-Po battery (managed by IP5306), and CH9102 USB-to-serial chip. It is available in 4MB and 16MB flash variants. An A7670E 4G LTE variant is also available on the same board form factor for regions where 2G has been sunset.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-call-v1-4&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export) — $16.51

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-call-v1-4&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FLilyGo-T-Call-SIM800&ref=openhardware.directory&product=lilygo-t-call-v1-4&source=md-export)

## Tags

`esp32`, `gsm`, `gprs`, `sim800l`, `cellular`, `sms`, `2g`

## Images

![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/2ff914e08d17.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/5a8ee76e9d1d.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/cbabba026744.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/ba549a70d683.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/589cfd1b5f32.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/4be052a73b4f.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/c350b5df23d4.jpg)
![LILYGO T-Call V1.4](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-call-v1-4/67379abaa904.jpg)

> **Battery Powered:** Li-Po

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