How much will it cost a newer iPhone model?

IIm on my parent s phone plan right now, and I get hand me down phones. I have the IPhone 3gs right now, but I want the iPhone 5. How much would it cost to upgrade to a new model? And would it be a newer model cost more per month?

The iPhone 5 has been discontinued for almost 2 years now, so you're not going to get one through your carrier.

You will have to find an iPhone 5 that is in good condition somewhere else, like eBay, Amazon or Craigslist if you're very careful.