I got my iPhone 6S on the day it was released, which means it will be paid off in a month or two. I would keep it, but I don't like how slow many things seem. When I go to voicemail, it plays the last voicemail for a few seconds before playing the one I just clicked on. Many things lag and show me the last thing that I looked at instead of what should be there. So I guess I will get a new iPhone. What should I do with the 6S? I am asking here because this issue with the old phone slowing down is the only reason I would get rid of it.