One useful function that all Nokia’s I’ve owned have is “Cell Info Display” which can usually be found in the phones “Display settings” (eg: in a Nokia 1600) or “Phone Settings” (eg: in a Nokia 3315) 

If your network supports it, when “Cell Info Display” is enabled, it will display the name of the base station your mobile is currently connected to on the screen eg: when i’m walking around the city it says “Sydney CBD” and when i’m at home it displays the name of my suburb. 

Note: 
To display “p” press “*” three times within one second, To display “w” press “*” four times within one second, To display “+” press twice “*” within less than a second 

Code Function 
*3370# / #3370# Activate / Deactivate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5% 
*#4720# / *#4720# Activate / Deactivate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time 
*#7220# / *#7230# Enable / Disable PCCCPH support (faster GPRS) 

#pw+1234567890+1# Provider Lock Status. (use the “*” button to obtain the “p,w” and “+” symbols) 
#pw+1234567890+2# Network Lock Status. (use the “*” button to obtain the “p,w” and “+” symbols) 
#pw+1234567890+3# Country Lock Status. (use the “*” button to obtain the “p,w” and “+” symbols) 
#pw+1234567890+4# SIM Card Lock Status. (use the “*” button to obtain the “p,w” and “+” symbols) 
12345 This is the default security code 

*#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type 
*#9999# Phones software version if *#0000# does not work 
*#06# For checking the International Mobile Equipment Identity (IMEI Number) 

*#67705646# Removes operator logo on 3310 & 3330 
*#73# Reset phone timers and game scores 
*#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 
press and hold # Lets you switch between lines 

*#7760# Manufacturers code 
*#7780# Restore factory settings 
*#8110# Software version for the nokia 8110 
*#92702689# 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 

Instructions to Network Unlock Your Mobile 
Once you have bought or found a network unlock code for your phone, this Network unlocking guide will give you step by step instructions to enter it into your: 

Nokia 1100/2100/3100/3120/3200/3220/3315/6610i 
Sony Ericcson A2618/T230/T610/T630/Z200/ 
Motorola T180/T190/T300/V171/V220 
Panasonic GD35, Philips Savvy, Siemens A35/55/65, LG C1100 
Nokia Error Messages 
Code error – appears if the unlock password entered is incorrect. You need to go through the whole process again, ensuring you enter the correct 10-digit code. 

Revealing the Headphone and Car-Kit menus
Please note that if you do these next tricks, the new menus can't be erased without retoring the factory default settings. To do these tricks you need to short-circuit the pins on the bottom of the phone next to where you plug in you charger.
1. To activate the "Headset" menu, you need to short-circuit pins "3" and "4". After a short time the word "Headset" will be shown in the display. Menu 3-6 is now enabled.
2. To activate the "Car" menu, you need to short-circuit pins "4" and "5". After a short time the word "Car" will be shown in the display. Menu 3-7 is now enabled.

THE REBOOT TRICK
This should work on all software versions of the 6110.
1. Go to the Calendar (Menu-8)
2. Make a note or reminder.
3. Enter some text into the edit box.
4. Hold "Clear" until the whole text is cleared, then press "Back".
5. Press "0". The main screen will now be showing but a space appears on the screen. (you can't see it)
6. Enter 4 digits (e.g. 1234).
7. Use the down arrow to move the cursor to the left side of the numbers and the space (Down arrow twice).
8. Now enter 6 digits and press the call button.
Wait for a few seconds, the screen should start to flash and reboots. It should alsowork on other menus like the "Profiles" menu.

EFR CALL QUALITY
To activate EFR (Enhanced Full Rate) Enter the code- *3370#
This improves call quality but decreases batterylife by about 5%

To deactivate it, Enter the code- #3370#

THE JAMES BOND TRICK
If you short-circuit theleft middle and right pins on the bottom of the phone with all connections touching each other, the Nokia software hangs! The profile "Headset" will be activated. Before you do this just activate the "Automatic Answer" in the headset profile and set the ringing volume to "Mute". Now you can use your phone for checking out what people are talking about in a room. Just place it under a table in a room and call it. The phone receives the call without ringing and you can listen to what people are saying.

NETWORK MONITOR
There is a hidden menu inside your Nokia phone. If you want to activate it, you'll have to re-program some chips inside of your phone.
Check your software version. You can only continue if you have v4.33, v4.73 or v5.24.
Take apart the phone.
De-solder the EEPROM (ATMEL AT 24C64).
Read out the data with an EEPROM programmer and save it to a file (Backup).
If you have v.33 or v4.73, change the address "03B8" from "00" to "FF".
If you have v5.24 then change the address "0378" from "00" to "FF".
Write the new data to the EEPROM and solder it back to the phone,
Power on your phone and you should have "Netmonitor" enabled.
The Network Monitor gives you the following information.
Carrier number
MS RX Level in DBM
Received signal quality
MS TX power level
C1 (Path loss criterion, used for cell selection and reselection). The range is -99 to 99.
RTL (Radio link timeout).
Timeslot
Indication of the transmitter status
Information on the Network parameters.
TMSI (Temporary Mobile Subscriber Identity).
Cell identification (Cell ID, Number of cells being used).
MCC (Mobile country code)
MCN (Mobile network code)
LAC (Location area code)
Ciphering (On/Off)
Hopping (On/Off)
DTX (On/Off)
Discard cell barred information
 

CHECK SIM-LOCK
Note - If you bought your Nokia on UK Vodafone or UK Cellnet you do not need to check this because they both transmit on GSM900, and they don't lock the phones. However if you bought your phone on UK Orange or UK One2one your phone may be blocked. The reason is that they both transmitt on GSM1800. To make a call on GSM1800 you need what is known as a "Dual band" phone. A dual band phone is able to transmit on both GSM900 and GSM1800, so they lock the phones so you can't use it with any other network simcard. If you find that your phone is locked you can try different software to unlock it. (we havn't found one that works yet), or you can ask your service provider who will gladly exchange the 10 digit code.

This is how to check the status of the 4 different locks. Aslo don't try entering the wrong number, because after 3 times it will block the phone for good.
There are 4 different locks on your Nokia phone.
COUNTRY-LOCK
NETWORK-LOCK
PROVIDER-LOCK
SIMCARD-LOCK
The code to read out the sim-lock status of your phone is
#PW+(MASTERCODE)+(Y)#
# = DOUBLE-CROSS
W = PRESS "*" THREE TIMES
P = PRESS "*" FOUR TIMES
+ = PRESS "*" TWO TIMES
MASTERCODE = 1234567890
Y = NUMBER 1 TO 4
The master code is a secret code. The code has 10 digits, To read out the sim-lock status you can enter every combination you want!
"Y" Shows the status of the network-lock. Here you can enter a number from "1" to "4". The "4" is for the sim-card lock.

SIM-LOCK CHECKS
#PW+1234567890+1# = GIVES PROVIDER-LOCK STATUS
#PW+1234567890+2# = GIVES NETWORK-LOCK STATUS
#PW+1234567890+3# = GIVES COUNTRY-LOCK STATUS
#PW+1234567890+4# = GIVES SIM-CARD-LOCK STATUS

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