The SIM800L GSM module is a small GSM module that allows devices to send and receive SMS text messages, make and receive phone calls, and connect to the internet through GPRS. It supports quad-band GSM networks worldwide and uses a micro SIM card. More information about the SIM800L GSM module is available at the provided link.

1. GSM-SIM800L
SIM800L GSM/GPRS module is a miniature GSM module, You
can use this module to design a simple Mobile to perform SMS
text messages, make or receive phone calls, connecting to the
internet through GPRS and TCP/IP. Sim800L module supports
quad-band GSM/GPRS network, meaning it works pretty much
anywhere in the world, and it supports the Micro SIM card
Follow this link to get more information…..
https://technoelectronics44.blogspot.com/2020/11/gsm-sim800l.html