Kudos to Brian Klug and Anand Lal Shimpi for measuring and graphing the (very nonlinear) relationship [article;graph] between iPhone 4 bars and signal strength, which helps explain what’s going on with the iPhone death grip.

Also, here’s a suggestion to AT&T, who might want to replace the slogan “More Bars in More Places.”

AT&T  iPhone image © Patrick Hoesly (Creative Commons Attribution 2.0 Generic)