This YouTube video is played at the beginning of Apple’s iPhone 4 Press Conference, which is currently ongoing.
![I Phone Signal Both](http://sanziro.com/wp-content/uploads/2010/07/i_phone_signal_both.jpg)
If you are curious to know the technical detail on what Apple has changed for the signal bar fix in iOS 4.0.1, check out the AnandTech article which is by far the best explanation.
[The iPhone 4 Redux: Analyzing Apple’s iOS 4.0.1 Signal Fix & Antenna Issue](http://www.anandtech.com/show/3821/iphone-4-redux-analyzing-apples-ios-41-signal-fix)