Anandtech has studied apple's new 4.01 OS update, and found that the new formula for displaying bars covers a much greater dynamic range. That is, it will show lower and higher signals than before, assigning those more extreme values as 1 and 5 bars. This means it'll require more signal to show higher bars, with the result of the iPhone showing 5 bars less often, but also showing "no service" less often, too. [anandtech via macrumors]