To connect to cellular (2G/3G/4G/5G), you have to listen for a beacon from a base station. If you don't hear a beacon strong enough, you aren't even allowed to

To connect to cellular (2G/3G/4G/5G), you have to listen for a beacon from a base station. If you don't hear a beacon strong enough, you aren't even allowed to try to connect (as it involves transmitting a connection request).