Can i go to my local sprint store and trade in my iphone 4s for a samsung galaxy s3?

My iphone 4s seems perfectly fine in condition. I've used a screen protector therefore has no scratches. It has a little scratch on the upper right corner but not very noticeable. So if i go to my sprint store, would i be able to trade it in even if i still have like another year for an upgrade? What would be the costs of doing this? Final question is should i do it? I'm more so thinking about trading it in because i've gotten tired of iphones and i want to switch it up. I never had a problem with my phone.

No
You would need to pay an early termination fee, or pay FULL price for the samsung phone.

Nope.

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