This new gadget 640XL is the most stylish and fully loaded phone , operating system is windows 10 latest version , that gives you the power to organize your work over phone , means that you dont need the pc go work . You can do it on the go. Camera quality is good , oprations are very simple and user friendly. In comparision to other operating systems I like windows personally. Configrations of the phone is not very high but the processing speed is very good. You dont think that it works slow, no in comparision to others its pretty effective.