My friend bought iphone 5S one year ago but this was worst decision made by him.
Iphone's major disadvantage is its storage problem, they provide monthly updates of applications which are neccesary to all users.
It has only a good camera with average processor performance, in other terms like battery backup, it has a very average performance.
At the end I just want to say that, this iphone 5S is only a wastage of money because they do not provide value for money, so don't buy this phone and invest your money in other device.
