Cost to upgrade from iPhone 4 to iPhone 5?

I have AT&T

It depends whether or not you have an upgrade. I have Verizon so I'm not 100% sure if ATT works like this, but you can trade in your iPhone 4 for an iPhone 5 and get a little bit off the already discounted price. So if the phone is $199, you may get the price reduced to $150.

If you do not have an upgrade or an upcoming upgrade, you're out of luck. You'll have to cough up the full $700 or so to buy it all full price.

Hope this helps!

If you have an upgrade on your contract then it will be $199. If you don't have an upgrade it will be like $650 I think. I had an iPhone 4S with AT&T and my contract wasn't up, I didn't like them much anyways so I terminated my contract with them and got the iPhone 5 with Verizon for only $218 and they have unlimited everything. I'm so glad I went with them.

I have Verizon, so I'm not exactly sure. I know for Verizon though that you can trade the iPhone 4 or 4s in and they'll actually buy it from you so you'll to upgrade to the iPhone 5. I think AT&T may have a similar thing going on but I can't exactly be sure.