Exchanging 32gb iphone 5 with 64 cost?

My 32GB iPhone 5 is about 5 months old, not a single scratch, buttons working perfectly, etc. But 32 arent enough. So how much would i pay if i exchanged it with a 64GB one?

Depending on what kind of service you have or what kind of exchange program your dealing with its hard to tell. Usually an iPhones go up about 100 dollars every 12 gb. So mostly likely i'd have to say since your device is used and in good condition you be paying about 200 dollars extra after the phone is traded in. But on another note iPhone 5's are discontinued now. They sell the iPhone 5c, and 5s only through cell phone company's and apple. Unless you go directly to the carriers store and they have models left over, or buy offline from eBay, craigslist or amazon, etc. To get another iPhone 5.