Hello! Just got my first DSLR Nikon D5300 camera. I'm learning about the Wifi / mobile app option. I don't have much data on my iPhone so generally I use it when I'm at a coffee shop or library. So when I connect to my camera from my phone to transfer pictures it appears to start using the phone's data to transfer pictures. So if I'm connected to Wifi at a library for example, it disconnects the library connection and then seems to use the phone data. I hope I'm making sense. Is there a way to transfer pictures from the camera to the phone while in a free Wifi zone? Thanks!