How to switch from iPhone 4S to 5?

Okay so my dad bought the 5, he said he would trade me for the 4s and $100. What do I have to do to switch? The SIM cards are different sizes, and I'm with AT&T.

Don't get the iPhone 5 wait till all the glitches are solved my friend got one and it was slow and just didn't do any thing right so wait a couple months

I would call at&t and see if they will just swap the 2… Thats probably easiest.

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