In the iPhone model, the networks are just dumb pipes.

The iPhone model, he insisted, would not look like the rest of the wireless industry.

We tried to replicate the problem with our own iPhone 4 models, fresh from the Apple Store this morning.

We can see the pace of processor improvement over the past three years of iPhone models.

Battery life is improved over the most recent iPhone models.

This doubles the capacity of older iPhone models.

Previous iPhone models were released during or after declining sales figures.

That's probably going to change when a new iPhone model appears, though.

Testing has so far shown that the new design and associated radio hardware do in fact improve reception over previous iPhone models.

Like previous iPhone models, the 16-gigabyte 4S is available on a two-year contract for $200.