When travelling I usually bring my camera for pictures and my Android phone for communication. Camera is better than the phone for pictures, since it works faster and has better quality sensor. But what if I want to send fresh pictures to someone? Then I need to transfer the files from the camera to my phone in some way. Since the camera doesn't have any wireless connection, the only way is to connect it to the phone is via cable.
I can of course purchase a micro-SD card and put it into an adapter to fit into my mini-SD slot in the camera and then put it without adapter into the phone. However, I would rather avoid this as exchanging micro-SD on my phone is not easy and requires me to open the case that is kept together with some fragile pieces of plastic. If I do this too often, it will break soon.