We're saying it's normal and within spec has has been since 2010 or so. I wouldn't worry about it.Thank you all. I noticed when I access the Camera app, I can still hear the rattle if I lightly shake the phone. What does it mean when others are saying the rattle does not occur when the camera is on? Is it that the rattle sound is not suppose to be audible when a recording or "while" pictures are being taken?
Get it checked at store. Can't hurt.
But I am amazed, after ten iPhones, I never once thought to shake it when I got it. Who knew, I might have had a defective one, used it for years not knowing. Just one more thing to add to my list for the iPhone 7, trial by fire on first day!