I mean little about modem / router so I don't know if the product I am looking for exists. That's why I ask you.
At home I have a Modem / router with Vodafone fiber that transmits via Wi-Fi to various devices ..
I would now like a device that extends the wifi signal to which we can connect, and if there is a power outage or network problems that may have the possibility of inserting a SIM in order to pass the data connection automatically. If all this had even a battery it would be great.
Thank you all!