This product I have used for more than 2 years.when it was new work properly but as it become older and older hanging problem starts .if I open more than 2 or 3 apps continuosly by minimising it the phone become slow and now screen not working proprly then I have to restart the phone and only after then it becomes usable.sometimes the power botton not work then I have to open the battry for switch off the phone.very irritative.but the camera quality is good flash light is also working properly.