How to activate iPhone after initial set-up?

I bought an iPhone 4S today from Radio Shack through Virgin Mobile, and after screwing around online trying to get my phone switched, it finally said that I successfully swapped.
Now, it gave me instructions on how to activate it, and connect it to the network.
The problem is, it says I had to do this when I first set-up the phone, and it's a little late for that.
How can I connect it to the phone network now?

I've never activated a CDMA iPhone before, but if it needs to be done on initial setup, connect it to iTunes, and restore it to factory settings. I wonder what exactly they're telling you to do to activate it?

They should have gave you a number like this *25 or *#25648#, the number they gave you dial it in your dial part of your phone, and once you put the last number or symbol in it will take you to the activation screen and just follow the instructions they provided to you.

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