I work in a very large building which has several AT&T dead spots. The signal on my iPhone is either very low or non-existant. Today I got a chance to walk around the building with the 3G iPad and most of the spots with low signal on the iPhone are now 2 bars stronger on the iPad. Most spots with no signal now have at least 1 bar. I realize this is an informal test but I've been in this building with an iPhone for 2 years and never have I seen any device work this well. Bravo Apple.