Apple is testing a small clamshell iPhone as a follow-up to its book-style foldable. The idea is in early study and has not been approved for mass production. Reporting attributes this to sources close to Apple and a Bloomberg newsletter.

Apple is Testing
Apple has long worked on foldable phone ideas. Recent reporting says an initial foldable that opens like a book remains the primary plan. Work on a smaller foldable that closes like a clamshell is also underway as a possible second step. The clamshell form would fold vertically so the device becomes compact when closed.
A clamshell model would let Apple offer two foldable styles. One would be the larger book model for bigger screens. The other would be a pocket-friendly clamshell model for people who want a smaller device. Bloomberg coverage notes Apple may choose the second design later, depending on demand.
Design and Trade-offs
A clamshell phone can be very small when folded. This helps people who want a pocket-friendly phone. The screen then opens to a larger display. This gives a mix of compact design and a roomy screen when needed.
Making a clamshell brings trade-offs. The fold adds a visible crease in the screen. That crease can affect image quality. A clamshell converter also lowers the light that reaches the sensor when optical elements are added. That could reduce low-light performance for photos.
Apple will weigh the trade-offs. The company tests durability, screen quality, camera output, and battery life. These tests will guide any decision to build a clamshell iPhone for customers.
Timing and Outlook
A clamshell model is not promised. The first foldable is the book-style device. That device could launch first, and then Apple will judge how the market reacts. Only if demand is strong would Apple move to make a clamshell. Bloomberg and other outlets say a clamshell remains a secondary option in the lab.
Apple has to balance many things. The company studies manufacturing yields, supply of parts, and market timing. An engineering time and a scale-producing supply chain are required for a new form factor use. Apple can do it only when design, supply, and business case go in the same direction.

How a Clamshell Could Fit the Line
A clamshell could serve buyers who once liked small phones. It could also draw buyers who want a novelty device witha compact style. Apple may sell the clamshell alongside a book-style foldable and the regular iPhone line. The choice will depend on sales and on how well the first foldable performs.
Apple has tested many form factors over the years. A clamshell iPhone is now one of the designs under review as the company plans its foldable future.
