Ring ring
*#06# Xem IMEI. *#300# OK Xem phien ban phan mem. *#301# OK Kiem tra ban phim. *#303# OK Chuyen sang tieng Anh. #304*19980722# OK Bat engineering mode. *#304# OK Tat engineering mode. *#307# OK Kiem tra engineering mode. *#311# OK Doi code mac dinh cua may. *#400# OK ADC, Cal, Val (Tui hok biet cai nay) *#402# OK Chinh do tuong phan man hinh. *#403# OK Thong tin tu nha san xuat. 19980722 Quan ly mat khau. *#302 OK Kiem tra Acoustic.