Can i cut my regular sim card down and use it in the iphone 4s?

I got an Iphone 4s the other day because i'm switching to a new plan in a month or two but i really want to use it now.
Right now i have a unlimited text and call plan but no data, i know you can turn off data and just use Wi-Fi.
My sister told me my plan might not even work on the iphone and i don't want to cut my sim if it won't work.
The iphone is at&t and so is my current phone so no worries there.

You can turn off data and just use Wi-Fi, sure. But you still have to pay for it.

All smartphones require data plans. Cheapest one is $15 a month.

So whether or not you use it, your bill will be $15 higher

You can cut down your SIM card to micro SIM. Since it's an ATT iPhone make sure you unlock it.

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