Apple's Signal Strength Display Changes in iOS 4.0.1 and 4.1 Detailed
Late last month, Anandtech detailed the signal strength drop-off experienced by iPhone 4 users when bridging the antenna gap at the lower left corner of the device, mapping how the "bars" of signal strength shown on the device correspond to actual si...
http://www.macrumors.com/2010/07/15/apples-signal-strength-display-changes-in-ios-4-0-1-and-4-1-detailed/
