Cingular Sim and a Jailbroken Iphone??????

[bluedrib]

i have cingular with the unlimited internet plan, and i want to put it in the jailbroken iphone..... My question.... is the internet plan i currently have the same as calling at&t and saying i want the iphone internet? They are both unlimited, and its not the blackberry data so what is the diff? will it show on my bill? unlimited internet is unlimited right?:foot:
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[bluedrib]

I looked the sim cards are similar but the on the iphone the gold section is rounded, and on the active sim its squared......does this make a diff? both sims look the same though with 3g logos and colors.