IPhone :: What Happens When Reactivate IP 2g With I4 Micro Sim / Adaptor?

What happens when you “reactivate” your iPhone 2g with the i4 micro sim and micro sim adaptor? Wondering what happens with the data plan if you change over to the iPhone 2g in case of emergencies/unforeseen circumstances, or if you need a phone that is more acceptable for loss or damage. Will this change the unlimited aspects of the plan? Does this re-sign you up for 2 years from the reactivation of the 2g, or does it just continue service as one would think it should, as there is no subsidy or contract renewal going on.I know its early, but has anyone tried this yet?

Assuming att makes this a poor choice for users to swap phones when it is advantageous , what are the option for making the iPhone 2g compatible with the new micro sim and the i4 simultaneously?Is JBing and unlocking the 2g a option to make the sims compatible simultaneously?Can anyone definitively answer this question at this point? Also a side question, I know I will want unlimited data for the foreseeable future, are there any precautions that I can take to lock myself in so att cant change my unlimited data to a limited plan? I have heard that some have called in and requested that there be a note on the account that no changes be made to the data plan without written conformation, is this a prudent solution to the issue?