剛剛發表會說的Facetime ???

剛剛發表會說的Facetime 是指不用WiFi就可以用
官網寫

FaceTime now works over cellular networks as well as Wi-Fi, so you can make and receive FaceTime calls wherever you happen to be.4 You can even make and receive FaceTime calls on your iPad using your phone number. That means you can use FaceTime wherever you are, on any device. And never miss another wink, smile, air kiss, or eye roll.

有大大可以解釋一下這只的意思是什麼嗎

謝謝！