check your mobile is orginal or not first check imie no. by *#06# seventh & eight digit are 00 this means your cell was manufactured original factory witch is best quality seventh & eight digit are 01or 10 this means your cell was manufactured in finland which is very good seventh & eight digit are 08or 80 this means your cell was manufactured in germany which is fair quality seventh & eight digit are 02or20 this means your cell was assembled in emirates which is very bad quality seventh & eight digit are 03or 13 this meanse your cell was assembled in azerbaijan which is very bad quality and also dangerous your health...