Can Laptop cards be used on Iphone 3g plan?

[makowb]

I'm thinking about switching to AT&T and was wondering if it was possible to use a laptop card on the same 3G plan that you use for the iphone. For instance, would I just be able to pop the sim out of the iPhone and put it into the laptop card temporarily? I don't really know anything about laptop cards and was thinking about getting one so I could have internet anywhere.

 

[kornyboy]

Wirelessly posted (iPhone: Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A102 Safari/419.3)

I believe AT&T requires a separate plan for the laptop card. Anyone else know anything different?