When a contact person blocked .then after sometime that blocked contact person fully ringing in this device.in contact segment blocking system need improvement . Your support members advices me this way.....this way..... This way... That way.....no any way solve this issue. Also rear camera segment when photos shooting one by one then suddenly some photos shooting bluer and dark comparison from objects conditions. I really worst feel from this device . I still waiting solve twice issues .when not solved issues. Your all device are costly then other brands comparison. I really sold this device to third person. And never buy any device of Nokia . And my friends and family person advice not buy any device of Nokia. I still agreely waiting to see twice issues solving.this photo shoot bluer and dark then objects condition.