SIM800L V2.0 Quad-Band GSM GPRS Module

The SIM800L puts basic cellular connectivity - the kind a normal phone has - onto a small breakout board a microcontroller can drive over a serial UART connection. Quad-band coverage (850/900/1800/1900 MHz) means it works on GSM networks in most countries, and it can send and receive SMS, place and answer voice calls, and connect to the internet over GPRS, all through AT commands sent from an Arduino or ESP32.

That makes it the standard choice for projects that need connectivity somewhere WiFi cannot reach - a remote field sensor, a vehicle tracker, an alert system for a location without WiFi coverage - since a GSM signal covers ground a WiFi router never will. The module includes an antenna connector, cable and cap, so it is ready to connect a small GSM antenna out of the box.

Common builds are SMS-based alert systems, GPS trackers reporting location over SMS or GPRS, and remote monitoring stations in locations too far from any WiFi network to use a simpler module.