VERIZON iPhone 5 setting up?

I got an iPhone yesterday, but there was a little mix up since we added a new line to get 4 smartphones for me and my parents and sister, so we got a new phone line for my sister. She's going to take my old phone temporarily until the other phones get shipped (because they didn't have 2 4's and a 4S in the store, so only I have my new phone.) I have a couple of questions.

How do you switch numbers between two cell phones?

If I set up a voicemail now, (the sales person said I had to wait 24 hours to switch numbers) will that voicemail greeting go to my sister's phone?

Umm I can't think of anything else, but thanks if anyone answers!

Take your cell phone to verizon store and have them do it. Its your best bet. I saw before on here that you can dial 611. Try that and see if that works. If that doesn't sorry.

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