How to switch from the iphone 4s to the 5 with sprint?

I have the Iphone 4s with Sprint. My friend is selling an Iphone 5 for Sprint and I want to buy it but I don't know how to switch them. Would it be the same as like switching phones if I had AT&T? Like, is there just a SIM card I take out of the 4 and put in the 5? Or do I have to take it to Sprint to switch it?

What's the monthly cost for an iPhone?

Someone told me that the cost of an iPhone was $30 a month for everything. This doesn't seem to make sense because I have a basic phone that's $30 a month. I've always heard that the iPhone is around $100 or more per month. Does anyone know what the fee's are?

How much is it to fix my iphone?

Also how do i use it? I cracked my screen and all my pixels are dead and how much will it be to fix it?
the whole front side is cracked bad but it still works the camera i fine and the home button is off the screen and the screen pops up. I kinda dropped it in water too and now its busted but it works but the touch screen doesn't work either cause all my pixels are dead as i said, i didn't have the tools and started fidgeting with it now the screen pops up

Why won't my computer recognize the music on my iPhone?

I can play the music on my iPhone, and I want to update my phone but not lose my music. Some of it was not purchased on iTunes, but I have used programs that transfer music to computer without the help of iTunes, and they don't recognize my music either! ITunes won't even recognize the music i have purchased from the iTunes store. I want to restore my iphone and thats why i need to get my music onto my computer. It is an iphone 4s running on 5.0.1.

How do people afford iPhones?

I'm using a basic phone for verizon. What type of network do you use for an iPhone cause verizon is way to expensive. How do people afford it?