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Maybe I dont know much about the iphone4, but i thought the sim card is smaller in size?
but it should not change your data plan.
I think you are correct about the SIM size. But they are compatible, you just have to put the mini-SIM into an adapter/spacer to hold it over the contacts and it will work.
oh ok. Then it will not change your data plan, but remember that for AT&T, you have to make sure you have the AT&T N1 in order to get the 3g data connection. If you have the t-mobile version of the N1, then you will only be able to get 2g.