A few weeks ago, I purchased the HTC Fuze with the PDA data plan at an ATT store.

Yesterday, I activated a 2G iPhone with this same SIM card, then proceeded to jailbreak and unlock it.

So, I have a couple of questions.

Is it possible to use the PDA data plan with the 2G iPhone?

Do you guys think I'm going to be charged for the PDA data plan and the iPhone data plan? When I went through the activation procedure in iTunes, it said something to the effect of "You must activate the iPhone data plan on your account to proceed."

Does anyone else had experience with swapping a SIM between the iPhone and a PDA phone? Is my bill going to be outrageous?