Apple Is Testing Huge Screens
Regardless of which design Apple goes with, there have been reports that Apple is testing some pretty huge foldable screens.
Rumor has it that Apple is working on large 8-inch and 9-inch displays. A 9-inch display would make the iPhone bigger than both the iPad mini (8.3-inch display) and the Samsung Galaxy Fold (7.6-inch display).
However, Apple is also said to be working on a foldable iPad, so that might be the reason it’s testing such big displays.
There have also been rumors that Apple is preparing to use color e-ink displays, which are basically lower-power screens designed for efficiency. Using a display like that on the outside of the “iPhone Flip” would make it easier to provide good battery life even with the extra screen.