The AT&T works pretty decent, but not where I am at right now. It works on my Motorola Atrix.
My boss has an iPad and iPhone, and he say's it just don't work for beans.
(his 3rd or 4th wife wanted to be styling tho)

Location and elevation to the tower is key tho.

The best pull's I got off this thing was when I was WiFi'd to the control system on mad mouse. Just under 10.

Up in the boonies, it will pull 6-8 if I am under or south of the power line out front. A hundred feet north, and it drops like a rock.

I need to figure this out because I will be a permanent resident of the boonies soon.