Apple is considering a larger inner screen for a future version of the device coverage calls the "iPhone Duo", according to Bloomberg's Mark Gurman.
Gurman made the comment on a new episode of his Power On podcast. He said he "heard" that Apple is "looking at" an inner display "roughly half an inch" larger than the one on the existing model. That is the whole claim. The name "iPhone Duo" comes from coverage of the podcast, and we could not confirm it as an Apple product name, so treat it as a label rather than a settled title.
The wording matters more than the number. "Heard" means Gurman is relaying information, not describing something he has seen. "Looking at" suggests an idea under evaluation, not a committed design. The source gives no release window, no price, no resolution and no panel supplier. It also does not say how big the current inner display is, so the percentage change cannot be worked out.
What the comment does imply is that Apple is already thinking about a follow-up to a model that is out now. That is a modest signal, and a modest rumor.
The open question is whether half an inch is a headline feature or a footnote. That depends on the starting size and on what else changes alongside the screen, and none of that has surfaced yet.