Well, it uses Wifi if available. If not, it will create its own ad hoc network which is very unreliable especially when in a room full of people.
Don't every rely on the XR18 network. It is not really better and has no routing functionality for devices connected to it.
Just buy a wifi router and connect all devices to that wifi. If you need internet, get a wifi router with a sim card slot so that it can provide internet access to all connected devices.