How to install a sim card in a iphone 4 with out a sim slot?

I bought a iphone 4 from america but i doesn't have a sim slot, how can i install my optus sim card in it and would it work with my optus sim card, i bought the phone unlocked, and it said verzion, i don't know what that mean but can some one help me
if use were wondering i live in australia

The back of the iphone can't be removed unless it is asked to do by a emploee from your local Phone store. To sort this out you will have to go to your local phone store for example Maybe go to the network you are with or Verizon because that is coming up at the top of your screen. Any Phone shop is ok but try and look around as you might get charged for the person to sort this problem out.

The Verizon iPhone 4 can't be unlocked because it is a CDMA device so there's no way to make it work on GSM networks (GSM requires a SIM card).

You got taken.

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