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iPhone 6s on JOD? You could invoke the Lifetime Coverage Guarantee and get T-Mobile to unlock the phone while you continue to make only the Jump! payments. This would allow you to get the 6s activated on just about any Canadian carrier. AFAIK, there's no option to just give the phone back.
Aww, that's sad you're wanting to leave but I understand why you're looking to end your service. You do have some good info above already. I just wanted to add that you'll want to Contact Us and have one of our care folks assist you with your options. As a side note, there's not an option to turn in the device outside of the buyer's remorse time.
I moved to an area not served by tmo a few years back, I roamed the entire time without issue. TMO removed my roaming data caps and allowed me to unlock my device. Which I'm grateful for, the Simple Choice North American plan is without a doubt the best value in my opinion.