in the past I was total apple iphone only upto the 6 I would replace both my handset's every year with question until they released the 6 so thin it looked liked the camera was superglued on the back such a bad handset (hopefully the new one will be better)
I always buy my phones second hand to save on money, in the past I have purchased an iphone that got network blocked, I took the handset back to apple who told me the phone was blacklisted in the UK but not to worry and promptly replaced the phone with another without any questions what so ever
so a few days ago my wife's Samsung