At the normal mode, if you shake the phone, the person list is disappear.
you hold the phone in a vertical position to scroll down through the list in order.
If you find the person you wish to call, you slowly move the phone to a horizontal position and shake it.
Then, you will make a call to the person.

The iPhone 17 Pro Camera Deep Dive: How 48MP Everything and 8x Zoom Actually Change Mobile Photography
After years of incremental camera updates that only mattered to pixel peepers, the iPhone 17 Pro’s camera system represents a
