The test was conducted in San Francisco in three different categories of areas:
one with good reception (5 marks), the other receiving media (3 marks) with the last receipt of 0.
Although the test was carried out on AT & T network
What emerged from the test?
What places of maximum reception, the two iPhones on display show the same number of notches (the top panel refers to the iPhone 4 update )
In places where reception is average, however, the iPhone 4 is not updated shows usually 1-2 notches more:
The most interesting thing, though, is that in areas with poor reception, such as garage and basement, with the iPhone 4 on iOS 4.0.1 has always shown at least a notch more than the device:
In practical tests the two phones have behaved in the same way: same call quality. Even where the iPhone 4 on iOS 4.0.1 showed a notch and the other no signal, in both cases it was impossible to call.