Confused about cell phone video calling?

Tymme

New member
T-Mobile (I think) does a commercial about how their video calls are so much better quality than Apple's. Don't really care either way. I'm just confused about the logistics.

To see the video, you have to look at the front of your phone, where the screen and buttons and such are. But... the camera's on the back... facing away from you when you're looking at the screen for the video chat, right? How do you chat back and forth- do you have to flip the phone around or use mirrors? Or is there another camera built into the "front"? Or is it one-way only... or what?
 
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