Some info in case u has a nokia... (Every code doesn't work in all nokia phones)
*#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time #4720# Deactivate Half Rate Codec 2 *#0000# Displays your phones software version,
1st Line: S software Version,
2nd Line: Software Release Date,
3rd Line: Compression Type
3 *#9999# Phones software v erosion if *#0000# does not work
4 *#06# For checking the International Mobile Equipment Identity (IMEI Number)
5 #pw+1234567890+ 1# Provider Lock Status. (Use the "*" button to obtain the "p, w" and "+" symbols)
6 #pw+1234567890+ 2# Network Lock Status. (Use the "*" button to obtain the "p, w" and "+" symbols)
7 #pw+1234567890+ 3# Country Lock Status. (Use the "*" button to obtain the "p, w" and "+" symbols)
8 #pw+1234567890+ 4# SIM Card Lock Status. (Use the "*" button to obtain the "p, w" and "+" symbols)
9 *#147# (vodafone) this lets you know who called you last *#1471# Last call (Only vodofone)
10 *#21# Allows you to check the number that "All Calls" are diverted To
11 *#2640# Displays security code in use
12 *#30# Lets you see the private number
13 *#43# Allows you to check the "Call Waiting" status of your phone.
14 *#61# Allows you to check the number that "On No Reply" calls are diverted to
15 *#62# Allows you to check the number that "Divert If Unreachable (no service)" calls are diverted to
16 *#67# Allows you to check the number that "On Busy Calls" are diverted to
17 *#67705646#R removes operator logo on 3310 & 3330
18 *#73# Reset phone timers and game scores
19 *#746025625# Displays the SIM Clock status, if your phone supports this power saving feature "SIM Clock Stop Allowed", it means you will get the best standby time possible
20 *#7760# Manufactures code
21 *#7780# Restore factory settings
22 *#8110# Software version for the nokia 8110
23 *#92702689# (to rember *#WAR0ANTY#)
Displays -
1.Serial Number,
2.Date Made
3.Purchase Date,
4.Date of last repair (0000 for no repairs),
5.Transfer User Data.
To exit this mode -you need to switch your phone off then on again
24 *#94870345123456789 # Deactivate the PWM-Mem
25 **21*number# Turn on "All Calls" diverting to the phone number entered
26 **61*number# Turn on "No Reply" diverting to the phone number entered
27 **67*number# Turn on "On Busy" diverting to the phone number entered
28 12345 This is the default security code press and hold # Lets you switch between lines
