One plus one is the popular phone which as very good sound quality with dual mono speakers, easy to use the camera quality as a wow factor with 13 mp rear camera and front camera is 5 mp it also supports 4k display.great value for money, phone does not hang the screen size 5.5inch screen which is add on advantage.the best part is internal storage of 64Gb and the ram of 3Gb, it runs on ANDROID 6 within feb 2017 they will be upgrade to 7.Negative:while using internet the battery drains fast and as it is moulded layman cannot replace the battery this the best phones we can have