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In my house it's a generational thing:

I made one FaceTime call when I first got the phone to try it out. Since then I've never used the front camera again. My daughters, on the other hand, use the front camera as much or more than the rear camera.
 
Taking pictures to troll my friends :D
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facetome and sometimes it's easier to take a pic with someone else if no one else is around.
 
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