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By retaining the same width, the thumb is still free to be able to travel across the entirity of the screen. A wider screen -- as found on a number of Android handsets -- are more difficult to use single-handed.
In March, a report by The Strategy Analytics Wireless Device Lab claimed that almost 90 percent of smartphone ownerswant a smartphone with screen in the 4.0-inch to 4.5-inch range, as long as the device is thin.
Smartphones sporting 4.5-inch displays are pretty large beasts. Take the LG Optimus 4G LTE, for example. This handset measures 133.9 x 67.9 x 10.5 mm, which doesn’t sound much until you put it up against the iPhone 4S, which measures in at 115.2 x 68.6 x 9.3 mm. That might not sound like a big difference, but in your hand it is.
On the iPhone my thumb comfortably travels across the screen, but with a larger handset I can’t do this, which turns using the handset into a two-handed job. This is not always an issue, but for tapping out a quick text message or email, having to wield a big smartphone is a disadvantage rather than an advantage.
Image source: iLab Factory.
The headphone connector appears to have been moved from the top of the iPhone and instead is on the bottom on the handset.
Reasons for moving the headphone connector range from helping to make the iPhone more rain resistant to allowing it to be leveraged in a dock.
The position of the power button does not seem to have been changed.
Image source: ETradeSupply.