Jim Dalrymple:

The answer seems quite simple: AT&T is afraid of what will happen to its network once millions of iPhone users start sending MMS and connecting their computer to the network.

I remember back in like 2002 hearing a Verizon Wireless employee warn a potential customer that they’re likely to use more minutes than usual with Verizon, since the network was much better than CellularOne’s.

This is much the same thing. Once you’ve made a phone that makes features easy to use, people are likely to start using them.