Friends, I buy this mobile before 5 months ago and I am happy with this product. you will read many nagative comments but believe me you will be more than happy after buy this. dual dolby function is most attractive and most advanced feature is VR mode called vartual reality mode where you can feel the real fun or gaming, thrill and watchig movies. I am thinking to buy another K4 mobile for my little sister. Trust me friends this is value for money product. I wish I can give it more than 5 stars. thank you Lenovo.