Why can't we change the iPhone to another one?

I got from some friends an iPhone 4S as a gift, but I want to change it for a 5 paying the difference. But the Apple Store says I can't! Should I try with some re-sellers? What do I do?

I think they plan on offering a trade in but that program is not in place yet.

Sell it and pay the difference

  • Why does it say read on one & then on another it just says delivered? On my iPhone when I'm iMessageing someone it just says delivered on it. But on my friends phone it says read at the time that i read it. And then on her phone she'll be iMessageing another person & it will also just say delivered? So I'm confused on how to get it to tell me when they read it or can i even make it like that?
  • Unlocked IPhone 5. Can be ported to one GSM provider but not another. Why? My friend in South Africa got an AT&T model of Iphone5. It is now unlocked and has been ported to one of his providers. He doesn't like the data rates and wanted it on either "Cell C" or "8TA" (which is Telecom Mobile) Both are GSM providers I believe. So why can the phone be ported to one GSM provider, but not the other? Should the Iphone 5 be possible unlocked in a different fashion? he assures me, it should work on the other networks in SA.
  • Is there an app where you can send videos from one iphone to another one? I need to send a vid to my friend, we can't use airdrop cos we don't live in same state, I also can't sent it on Facebook. Is there and app or a feature besides iMessage where I can send a videos, any lenth?
  • Is tbere any major différence between thé iPhone 6 and the 6s? Whooppeee is Xmas again and my daughter wants new 2nd hand) iPhone… 2 years ago almost bought her 5 before i réaliséd that it was 5s she wanted ( cos thé 5 sucks?) And I don't want to screw up this year…