Yes. Note that this is a two way data communication, one side has to receive the data, where the other part is sending. Do not think as a phone call where the caller pays the cost. No.
The dongle 2 needs a 4G enabled Ism that has data to connect to the Dji Servers. The RC needs a data connection either via wifi or mobile hotspot to your phone to be able to communicate with the dongle 2 in the drone. If the RC has no Data...
Good picture - nice range of colours! I guess that would be a winner at our photo club and I’m not jealous in the slightest as I sit in a caravan in Scotland with the rain coming down🌧️