Using this free speed test app from the app store
http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=286356274&mt=8
Signal strength 57 on 3G --- gave me 544K down and 166 up.
Signal strength 57 on Edge - gave me 114K down and 43 up.
Signal strength 51 on Edge - gave me 146K down and 49 up.
Couldn't get a 51 on 3G. Leaning and sticking my arm out the 3rd floor window showed me a fleeting 53, but even going outside circling uphill above the roof and downhill below subbasement gave me no joy - even though good line of sight in any direction could be found.
But, as far as scaling, it looks like the line between 4 bars and 5 is 83 / 85.
4 bars = 85 and higher
5 bars = 83 and lower
Edit: forgot to mention, there are still huge problems with att on 3g. There is no reason whatsoever the app store is unable to load the top 25 apps on 3G when I give it 4-plus
minutes, but manages to show that list in under 15 seconds when I turn off 3G.
What. The. H
*. >:(