Are there any physical changes between the iPhone 3G and the current model?
A few. As described in our hands-on look at the iPhone 3G, the back is now plastic (black on the 8GB model, black or white on the 16GB model) and the volume buttons on the left side of the phone are now silvery metal. The headphone port on the top of the device is now flush with the iPhone’s body, not recessed like the jack on the current model. That means you if you have a favorite pair of headphones, you’ll no longer need a headphone adapter to make them work with the iPhone. One other iPhone 3G design note: The handset’s edges are thinner and more curved than in the previous version. That helps hide the fact that in the middle, this model is a little thicker than the original. Of course, the new phone also weighs a little less than the current model, though we’re talking a tenth of an ounce. If you notice that difference, a career in weights and measures awaits you.
