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% incerase 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 Enhanced Full Rate Codec(  EFR)
*#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 oftware Version,
2nd Line : Software Release  Date,
3rd Line : Compression Type
3 *#9999# Phones software v ersion 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 Unrea chable(no service)" calls are diverted to
16  *#67# Allows you to check the number that "On Busy Calls" are diverted to 
17 *#67705646#R emoves 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
Each command is  prefixed with either one or two * or # characters as follows:
** Register  and Activate
* Activate
## De-Register (and Deactivate)
# Deactivate 
*# Check Status
© Call button
Once each command has been  entered, if it is a network command (as opposed to a local handset command) it  must be transmitted to the network by pressing the YES (receiver) key which acts  as an enter key - this is represented here with the © character. Always enter  numbers in full international format +CountryAreaNumber ( e.g. +447712345678). 
Command Description Command String
Security
Change call barring  code **03*OldCode*NewCode*NewCode#©
Change call barring code  **03*330*OldCode*NewCode*NewCode#©
Change PIN code  **04*OldPIN*NewPIN*NewPIN#©
Change PIN2 code **042*OldPIN2*NewPIN2*NewPIN2#© 
Unlock PIN code (when PIN is entered wrong 3 times) **05*PUK*NewPIN*NewPIN#© 
Unlock PIN2 code (when PIN2 is entered wrong 3 times)  **052*PUK2*NewPIN2*NewPIN2#©
Display IMEI *#06#
Call Forwarding  (Diversions)
De-register all call diversions ##002#©
Set all configured  call diversions to number and activate **004*number#©
De-register all  configured call diversions (no answer, not reachable, busy) ##004#© 
Unconditionally divert all calls to number and activate **21*number#© 
Activate unconditionally divert all calls *21#©
De-register  unconditionally divert all calls ##21#©
Deactivate unconditionally divert  all calls #21#©
Check status of unconditionally divert all calls *#21#© 
Divert on no answer to number and activate **61*number#©
Activate divert  on no answer *61#©
De-register divert on no answer ##61#©
Deactivate  divert on no answer #61#©
Check status of divert on no answer *#61#© 
Divert on not reachable to number and activate **62*number#©
Activate  divert on not reachable *62#©
De-register divert on not reachable ##62#© 
Deactivate divert on not reachable #62#©
Check status of divert on not  reachable *#62#©
Divert on busy to number and activate /td>  **67*number#©<
Activate divert on busy *67#©
De-register divert on  busy ##67#©
Deactivate divert on busy #67#©
Check status of divert on  busy *#67#©
Change number of seconds of ringing for the given service before  diverting a call (such as on no answer). Seconds must be a value from 5 to 30.  De-registering the same divert will also delete this change!  **service*number**seconds#© (Service numbers, see below)
Call barring 
Activate barr all outgoing calls (see Security to set code) **33*code#© 
Deactivate barr all outgoing calls #33*code#©
Check status of barr all  outgoing calls *#33#©
Activate barr all calls **330*code#©
Deactivate  barr all calls #330*code#©
Check status of barr all calls /td>  *#330*code#©<
Activate barr all outgoing international calls **331*code#© 
Deactivate barr all outgoing international calls #331*code#©
Check  status of barr all outgoing international calls *#331#©
Activate barr all  outgoing international calls except to home country **332*code#©
Deactivate  barr all outgoing international calls except to home country #332*code#© 
Check status of barr all outgoing international calls except to home country  *#332#©
Activate barr all outgoing calls **333*code#©
Deactivate barr  all outgoing calls #333*code#©
Check status of barr all outgoing calls  *#333#©
Activate barr all incoming calls **35*code#©
Deactivate barr all  incoming calls #35*code#©
Check status of barr all incoming calls *#35#© 
Activate barr all incoming calls when roaming **351*code#©
Deactivate  barr all incoming calls when roaming #351*code#©
Check status of barr all  incoming calls when roaming *#351#©
Activate barr all incoming calls  **353*code#©
Deactivate barr all incoming calls #353*code#©
Check status  of barr all incoming calls *#353#©
Call waiting
Activate call waiting  *43*#©
Deactivate call waiting #43##©
Check status of call waiting  *#43#©
Calling Line Identification
The following only works if CLIP and  CLIR are enabled (ask your service provider)
CLIP: Presentation of the  number of the incoming call
Activate CLIP **30#©
Deactivate CLIP ##30#© 
Check status of CLIP *#30#©
CLIR: Presentation of one's own number to  the to the called party
Activate CLIR **31#©
Activate CLIR for the  actual call *31#number©
Deactivate CLIR ##31#©
Deactivate CLIR for the  actual call #31#number©
Check status of CLIR *#31#©
COLP: Presentation  of the actual number reached (if number called was diverted to another number 
Activate COLP *76#©
Deactivate COLP #76#©
Check status of COLP  *#76#©
COLR: Presentation of the original number called by the calling party  (if the call was diverted to this cellphone)
Activate COLR *77#© 
Deactivate COLR #77#©
Check status of COLR *#77#©
 
 

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