If you want to share files with a friend, Blue NFC is a simple way to do it. By downloading the app, you can share files through Bluetooth by tapping phones. (NFC is the handshake, and Bluetooth transfers the file.) For example, if you want to share that cool shot of the beach you got on your last vacation, go into your Android smartphone's Gallery, press the Menu button, tap Share then select Blue NFC from the drop-down menu.