In a speech at Apple's conference for programmers, Mr [Steve Jobs] said that video calls would only work with WiFi connections, at least this year, and only between iPhone 4s.
As expected, the iPhone 4 features a much sharper display than the iPhone 3GS, including four times as many pixels, or about three-quarters of the number in the far larger iPad tablet computer's display.
Mr Jobs defended Apple's lead, citing new Nielsen figures that give Apple 28 per cent of the US smartphone market, versus 9 per cent for Android.
