I would like to install this device in my caravan. As we are on campsites, I would like to ask whether this device can also be used as a WiFi router without a SIM card? Is it possible to log in via the campsite's wifi and connect several devices to the wifi via the router? On many campsites you have to buy a separate access for each device, now I am looking for a router where I only have to buy one access to the wifi and can connect the rest of the devices to the router. Thank you very much