Os. android . its weight 558g. formfactor trouh screen. its has best phone in the a world in india, . its has good quality of the sound reception . user friendlt all phone . its very beautiful phone . its has beautlful design im the phone. it har internet veryfast in the phone . it has more features in the phone . it has more games, it has galery more proute . iu.it has high price but imagtion law perice in p. the phone .