Mobile phone QQ Face-to-face fast transfer function how to use?

1 we open QQ in the click of the interface in the upper left corner of the personal head, as shown in the following figure we click on "My Files" into. (as shown in the following figure)

2 Then in the open "my file" you will see there is a "face-to-face quick pass" function, then, will need to receive the phone QQ also open to receive the same method. (as shown in the following figure)

Okay so that is not required to receive traffic, but a bit to pay attention to, said to be face-to-face is definitely under the same network, if not the same network under the natural function of the need for traffic oh or not to use OH.