The new video offers a detailed look at the historically significant iPhone 4S prototype

A new video released by the Apple Demo YouTube channel this week offers a really cool look at a prototype version of the iPhone 4S. The video shows the iPhone 4S during the design validation testing phase of its development, with an interesting link to Steve Jobs’ tenure at Apple.

For the background, Apple’s hardware development typically moves through stages including EVT (Engineering Validation Test), DVT (Design Validation Test), and PVT (Production Validation Test). This video shows the iPhone 4S in the DVT stage, a point where many decisions had already been finalized.

This iPhone was used by engineers to analyze software behavior in the event of a “crash of a specific hardware component, known as baseband,” the video explains. After the baseband crash, the phone checked that the baseband and associated data were still readable.

The iPhone 4S in the video runs a form of iOS not designed to be used by consumers. Applications on …

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