The TTGO T-Call is an ESP32 development board that combines a SIM800L GSM/GPRS module.This allows you to connect your ESP32 to the internet using your SIM card data plan, or communicate with the board vis SMS or phone calls. This can be very handy for projects in remote locations.The SIM800L works on 2G networks, so it will only work in your country, if 2G networks are available. Check if you have 2G network in your country, otherwise it won’t work.
When you get your TTGO T-Call ESP32 board, it comes with header pins that you can solder to the board to access the ESP32 GPIOs to connect peripherals like sensors or outputs.
This allows you to control outputs or monitoring sensors just by sending SMS or making phone calls to your ESP32.
This can be a perfect board to put in a remote location to control an output when you send an SMS or to get sensor readings in your smartphone.
Working voltage:2.7-3.6 volts
Working current: 70 mA
Sleep current:300 microamps
SIM card:only supports Nano SIM card
Operating temperature range: -40°C~+ 85°C
Dimensions and weight:78.83 mm* 28.92 mm* 8.06 mm (11.77 g)
Power supply :USB 5 V / 1A
Load current :500 mA
Battery :3.7V lithium battery
JST connector:2 pins 1.25mm
USB interface:Type C
Frequency range :2.4 GHz to 2.5 GHz (2400 M to 2483.5 M)
Transmitting power: 22dBm
Communication distance :300 meters
T-call V1.3 * 1
Power cord * 1
Pin Header * 2
Gprs, Antenna * 1 (7 cm)
Power cord * 1