Ma so bi mat motorola *#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 (???). *#402#ok : chinh do tuong phan. *#403#ok : thong tin nha san xuat. *#302#ok : kiem tra Acoustic. *#19980722#ok : quan ly mat khau.