This holder with the iPhone 17 Pro Max (and any others about 163 mm long), designed to be worn on the back of the left hand, is suitable for use in a car and airplane, on a bike (with a high handlebar), scooter, motorcycle, as well as when walking and running.
The phone is carried with the screen facing the hand, which protects it from accidental damage.
To use the phone, you rotate it and position it above your hand, which is more comfortable than holding it in your hand, as your palm remains free to grip the steering wheel. The distance between the car driver eyes and the screen is optimal. To take a photo, open your palm and move your thumb to the left or right. Your other hand operates as usual - holding the phone and pressing the button with your finger.
The holder is being patented.