First of all its a brand called apple.
This iphone has release just 3or4 months ago.It has a major advantage that it has the processor of Apple A9 that any 4"phone still not got.its the powerfull four inch phone ever.
It has camera records in the quality of 4k and it has the feautire called slo-mo which takes slomotion videos and that is amazing.This phone looks exactly line an iphone 5s.Its size is ".it is very handy.
