I'm not a data hog - I'm a power user
I really resent the term "data hog" by AT&T. They offered an "unlimited" data plan. If you are using a lot of data, it means you are using the product as intended and advertised. There are those like my mother, who use about 1K of data transfer a month on their iPhones, then there are average users, then there are power users.
If after data usage has gone up, I can see why AT&T may want to revisit its pricing structure for new customers, but to claim that most of their customers were 'subsidizing' the supposed 3% of "data hogs" is insulting. No - they were paying for an unlimited data plan. If you want to offer a cheaper, tiered plan for those who use very little data - then do so. The onus is on the telco, AT&T, to be the expert in the industry in which they are a part, to create a network that can support its customers.
This is like the health clubs that oversell their memberships because they suspect a certain number will stop showing up. When their guestimates are wrong and more & more people are showing up to the club to work out, they end up waiting on the machines instead of the club coughing up the bucks to expand and add more machines. This is what is going on w/ AT&T.
Let people opt for a more expensive 'unlimited' data plan instead of removing it altogether. It's stupid. Why would I want to own a device that can do all that an iPhone can do if I'm scared to use it because the bill might be higher than I anticipated? No - AT&T wants its customers to subsidize its lackluster network and poor preparation.
My theory is that they know once Apple delivers the next "one more thing," people are going to be using even more data than ever. I'm thinking Apple talked to them about competing w/ Netflix - enabling people to stream movies from the iTunes store over 3G and they crapped themselves because they knew smoke would be billowing out of all of their cell towers, so as a pre-emptive strike, they decided to pull this number on the unlimited data plan.
Regarding coverage and dropped calls...
I lived about 50 miles north of the DFW metroplex for the first 2.5 years as an iPhone customer, commuting to Dallas and experienced the dropped call problem on a regular basis, no matter who I was talking to, all the while on major highways - mostly I35E, which according to AT&T's coverage map, is totally saturated with coverage. Since getting married 6 months ago, I now live about 60 miles SE of the metroplex and take other major highways (depending on traffic) for my commute such as 75, 635, 20, and 175 - and again, my experience is the same no matter where I am. I cannot have a phone call last for more than five minutes without dropping a call. As more iPhones join the network, the problem has gotten steadily worse. I don't recall getting dropped calls much at all when I first got the 2G iPhone in 2007 - but it took a year to sell 2 million of them. Last year, it took a month to sell 10 million of them and the problem continues the doubling affect.
AT&T has managed to bolster their network in the places Steve Jobs is most likely to travel, but the problems are aneurism-inducing in other areas.
I not only get dropped calls (as does my mother, my husband and all my colleagues at work that switched from Blackberry to iPhone) on a regular basis, I also lose data connectivity regularly... and per month, I'm only using about 1GB of data, well below their newly tiered data structure plan. I've been in spots where I got turned around and had to use Google Maps only to have to wait for the "No Service" message to go away and for the 3G to show back up... or at least Edge.
No other phone would get away with this crap. Seriously. If this was some cheap flip phone, people would be marching in the streets with axes, torches and effigies for burning.
If AT&T cannot even handle web traffic via computer to take pre-orders for the phone, what makes you think they can handle the traffic generated by all the people who will be new users with iPhone 4?
My coworkers have been complaining like crazy since they switched from their blackberries. They love the iPhone, but say they never once experienced a dropped call on the blackberry and now it's a regular occurrence.