For the project I used this KeeYees kit that can be purchased at this link: https://www.amazon.it/KeeYees-GY-BME280-Atmosferica-Temperatura-Breadboard/dp/B07T2H5QXC ...

Place the SIM800L library folder into your \Documents\Arduino\libraries folder. You may need to create the libraries subfolder if its your first library. Restart the ...