My old Windows phone (samsung ativ S) was perfect! Following his flight I wanted to buy me a phone with similar features but unfortunately this is not the case with this phone! The battery discharge is extremely fast even when all options are disabled, that enabled energy economy mode, the battery from 90 to 30% in the day !!! Regarding Windows, it is more complicated than on the Samsung or it may be the new version. There énorméments parameters that seem unnecessary or incomprehensible.