I am using iphone 5s .there is no problems which using these phone.i continuesly using this iphone 5s as 1 year.there will be not problems.But in our new updation ( ios 11.1.) .There was mistakes.Comparitivily less problems.Mainly software problems.There is not proper working of touch display.But many advantages in there.Another problem is stuck whatsapp many time.not only whatsapp.Messenger also opposing this problem.i think it is first and latest updation of apple.So were the next updation we can expect solution or solved these type problems