A lot of people, including John Gruber, seem to advise that AT&T's new 2 GB limit is 'plenty'. I've been an iPhone + T-Mobile user since the iPhone's launch (and later switched to an iPhone 3G, but skipped the 3GS). I switched to AT&T and an iPhone 4 exactly one week ago. In seven days, without being abusive or running any jailbroken applications or servers, I have used close to 900 MB of data. I'm almost certain I'll hit 2 GB by the end of the month. My usage habits have certainly changed, considering that prior, I only got EDGE on my T-Mobile iPhone, and my iPad couldn't multitask to run applications like Pandora in the background. iOS 4 and 3G have greatly increased my usage, and I'm extremely satisfied with the iPhone; but I'm paying nearly twice as much for service as on T-Mobile, and it looks like I'm going to start paying extra monthly fees on my iPhone as well. Oh yeah; and I never dropped one call on T-Mobile, barring one time while dropping 10 floors to the basement in an elevator. I've dropped two already on AT&T...though I'm not sure if the calls dropped, or the proximity sensor didn't activate and my cheek hung up (I didn't initially realize that the iPhone is on 4.0.1 when I unboxed it, and haven't upgraded to 4.1 yet). I always figured people exaggurated these issues V_V Anyway, I've seen a lot of people asking around whether 2 GB would be enough, and people seem to unanimously answer "Yes!". I just wanted to throw my "No" on the pile. Nice job with the phone, , but boo to the carrier.