i had an iPhone 5S a few years ago, now I got a Samsung S7 coming back to iPhone since not many changes to the 7 I was thinking of just getting the 6s plus it will be cheaper and get the new Apple watch and worry next year about the new version since next year they overhaul it a lot more, quick ? Will my Samsung SIM card fit in an iPhone? I've heard there not compatible sometimes. I guess verizon would give me one