*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 lai.
*#2640# : hien thi ma bi mat dang su
dung.
*#2820# : hien thi bluetooth.
*#7489# : hien thi man hinh bao ve.
*#3925538# : xoa bo chi tieu.
x# : xem so thue bao vi tri x trong the
sim (x tu 1-255).
#pw+1234567890+1# hoac +2#, +3#,
+4#, +5#, +6#, +7# : kiem tra co khoa
hay khong.
#pw+xxxxxxxxxxxxxxx+1# hoac +2#,
+3#, +4#, +5#, +6#, +7# : mo khoa ma
symbian.
>>Format may symbian s60: Tat
nguon roi an giu dong thoi cac phim
*, 3, goi di va nut tat mo nguon. Cac
giu lieu luu tru trong bo nho dien
thoai se bi xoa.
(Ma bao ve mac dinh cua Nokia:
12345).
