The latest iPhone 16 Pro prototypes seen MacRumors, We suggest that Apple has redesigned the Action button and it now resembles the Action button on the iPhone 15 Pro. Apple has been playing around with the size and design of the Action button for the ‘iPhone 16 Pro’, but the company is sticking to the tried-and-true design for its latest ‘Proto2’ development.

At various stages of development of the iPhone 16 Pro, Apple tested four button configurations and two sizes for the Action button.

• Unified volume button with a small action button
• Unified volume button with a large action button and a new capture button
• Separate volume buttons with a large action button and flush-mounted shutter button
• Separate volume buttons with small action button and frame-level shooting button (valid)

The earliest known ‌iPhone 16 Pro‌ prototypes both had a combined volume rocker and a small, multi-purpose Action button on the left side and a power button on the right side. This design was first developed as part of Project Bongo, an initiative to add tactile buttons to the “iPhone 15 Pro.” Although the project was eventually canceled due to unsatisfactory test results and a high rate of hardware failures, parts of the Bongo design, namely the unified volume button, found their way into the first “iPhone 16 Pro” designs.

The second variant of the ‌iPhone 16 Pro‌ prototype also used a unified volume button but had a larger Action button that was close to the volume buttons in size. This prototype also had an additional “capture button” under the right of the power button.

Later prototypes (pictured above) featured separate volume buttons rather than a single button design. On these new devices, Apple planned to include a capacitive action button and a hold button, both flush with the bezel and equipped with force-sensing technology.

Apple has changed the action button once again with its latest “Proto2” design. Apple has now introduced a smaller action button that mirrors the action button on the “iPhone 15 Pro.” While it’s currently unclear how this will affect the future of Apple’s work on the capacitive action button, such a significant design change suggests it’s being scrapped or postponed for future iterations of the iPhone.

While the information presented here accurately describes the current interior design, it is important to note that additional design changes are always possible and the information presented here may not reflect the final design of the “iPhone 16 Pro”.