Can I trade my S3 for an Iphone5?

I just had my Samsung Galaxy S3 last November 2012 via 2 year-contract in T-Mobile. Is there way where can I trade my S3 for an Iphone5. I've always wanted an Iphone for a smartphone in the first place. The only reason that I got a S3 is that T-mobile doesn't have an Iphone last November. I'm into Apple devices.PS: T-Mobile is releasing their Iphone5 on April 12.

Better

First of all, the S3 is better than the iPhone. More Free Apps. Long Battery Life. You can start calling a person by just putting the phone up to your ear. If you use bluetooth on the iPhone 5 you can only use it on iPhone to iPhone. But the S3 can be used on any device.

And yes you can exchange your S3 for an iPhone5 but it'll cost a lot since you have a 2 year contract.So. It's up to you.

Yes you should be able to you still might need to pay a little bit of money but not much