1) Imagine ur cell battery is very low, u r expecting an important call and u don’t have a charger.
Nokia instrument comes with a reserve battery. To activate, key is “ *3370# ”
Ur cell will restart with this reserve and Ur instrument will show a 50% increase in battery.
This reserve will get charged when u charge Ur cell next time.
*3370# Activate Enhanced Full Rate Codec(EFR)-Your phone uses the best sound quality but talk time is reduced by approx 5%
#3370# Deactivate EnhancedFull Rate Codec( EFR)
2) *#0000# Displays your phones software version,
1st Line : Software Version,
2nd Line : Software Release Date,
3rd Line : Compression Type
3) *#9999# Phones softwareversion if *#0000# does notwork.
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# SIMCard Lock Status.(use the “*” button to obtain the “p,w” and “+” symbols).
9) *#147# (vodafone) this lets you know who called youlast *#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 NoReply” calls are diverted to.
15) *#62# Allows you to check the number that“DivertIf Unreachable(no service)”calls are diverted to.
16) *#67# Allows you to check the number that“On Busy Calls” are diverted to.
17) *#67705646# 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 ClockStop 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#