Glenn Fleishman:
This prompted me to check my usage, which you can do in the Settings app by tapping General → Usage, and then scrolling down to the Cellular Network Data section and adding the two numbers there. As far as I can tell, I haven’t reset the phone’s usage statistics: I’ve used a combined total of 1.9 GB over 7 months or about 270 MB per month, just over the limit. I checked my AT&T account to see how much I used in January, a month in which I traveled with the iPhone and no laptop - just 150 MB total.
Since 09/30/09 I’ve sent 657MB, received 5.3GB of data. That’s about 1.5GB/month *just* on my iPhone.
At first, that would make me think I wouldn’t be able to survive using the cheapest plan. But am I going to walk the halls browsing the web and check Twitter using the iPad at work? I also can’t really see myself using the iPad while driving. (Not that I really should be using the iPhone while driving, but you get the idea.)
The 250MB is fine for me.