Lisa Eadicicco
Both phones come with Apple's new 3D Touch technology, a better 12-megapixel camera, a more durable design, and various other improvements.
Preorders for the phones started on Sept. 12, and Apple previously said that it's on track to break its opening weekend sales record of 10 million units this year.
If you're planning to get your new iPhone the day it launches on Friday, here's a look at what to expect.