Ma so bi mat nokia
*3370# (efr0) : kich hoat che do EFR, cho chat luong am thanh tot hon
nhung ton pin hon.
3370# (efr0) : tat che do EFR neu da bat, may se khoi dong lai.
*4720# (hrc0) : kich hoat che do HRC, chat luong am thanh kem nhung it
ton pin hon.
4720# (hrc0) : tat HRC neu co dung, khoi dong lai may.
*#0000# : thong tin phan mem (phien ban, NSX, ten phan mem).
*#7760 (srn0) : xem so seri.
*#06# : xem IMEI.
*#92702689# (war0anty) : cac thong tin bao hanh.
*#746025625# (sim0clock) : kiem tra sim xem co che do tiet kiem pin hay khong.
*#7780# (rst0) : khoi dong lai may (can nhap mat khau).
*#7370# :khoi phuc cai dat goc (can nhap mat khau).
*#7370925538# (res0wallet) : luu tru bi mat wallet (phai biet mat ma may).
*#67705646# (opr0logo) : xoa logo mang, du ve mac dinh la ten mang
cung cap dich vu.
*#7220# (pca0) : kich hoat che do PCCH tiet kiem thoi gian truy cap
gprs (tuy vao mang cung cap dich vu).
*#7230# (pcd0) : tat PCCH, may tu khoi dong la