Swapping Out T-Mobile for Verizon (iPhone 5)?

What would be the best way to swap out a second hand iPhone 5 16GB for T-Mobile, for an iPhone 5 16GB for Verizon?

I'm purchasing the iPhone from someone who is on T-Mobile, but I have Verizon. What would be the best decision when it comes to swapping? Will Verizon do an even swap for a Good Condition iPhone 5 to new iPhone 5? Or am I just going to get a credit towards the new one? How will it work? Or would I just be better off selling it and paying the difference for a new one?

I'm looking to swap my verizon iphone 5 with T-MOBILE… I purchased it in March and planning to pay Early Termination Fee. We can swap… Please mail me at nitin11agg at gmail dot com

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