Return iphone process?

You turn off find my iPhone, restore it, remove sim card, and return it where you bought it.

 

Apples full return process is also listed on their website for reference.

 

Yep, this is exactly what I did with my wife's 6s Plus that I returned last week. Told the Apple Employee that I was there to pick up a reserved iPhone 7 plus and I was returning the 6s plus in my hand. Probably the easiest return transaction I've ever had.