There's no mistaking Apple's new iPhone 4 for any of its three predecessors. This angular, precisely-machined device -- only three-eighths of an inch thick -- looks and feels little like the smooth, streamlined iPhone, iPhone 3G and iPhone 3GS.
The innards of the iPhone 4 -- $199 for a model with 16 gigabytes of storage, $299 for a 32 GB version, with AT&T the only service option in the United States -- offer other departures from the past.