Fallowing codes work on all Nokia phones;
*#06#  Display the IMEI - International Mobile Equipment Identity (Standard GSM command, works on all phones)
*#0000# Display the firmware version and date
*#92702689#  Nothing but pressing WARONTY on your mobile keypad (*#war0anty#) It takes you to a secret menu where you may find some of the information below:
1. Displays Serial Number.
2. Displays the Month and Year of Manufacture
3. Displays (if there) the date where the phone was purchased (MMYY). If you want, you can edit and enter your phone purchased month and year.
4. Displays the date of the last repair - if found (0000)
5. Shows life timer of phone (time passes since last start)
 The following codes are specific to older series 40 (S40) phones;  (Entering the following codes will restart the phone)
Activates Half Rate, Half Rate is 5.6kbit/s and uses half the bandwidth at the cost of call quality. Network operators often activate half rate on overloaded towers during peak times to save costs.
Deactivates Half Rate
(*efr0#) Enhanced Full Rate Codec (EFR) activation. Increase signal
strength, better signal reception. It also help if u want to use GPRS and the service is not responding or too slow. Phone battery will drain faster though.The calls are 12.2kbit/s and are not supported by all operators. It is compatible with the highest AMR mode.
Deactivates Enhanced Full Rate.Phone will automatically restart. Increase battery life by 30% because phone receives less signal from network.
Display the SIM clock status

The following codes are phone specific or phase related
Activate the GPRS PCCCH support (Packet Common Control Channel)
Deactivate the GPRS PCCCH support
Display the manufacturing serial number

This only works on the 3310 and 3330;
Clear the operator logo, the logo will be reset to the default network operator logo.

The following codes work on newer series 40 & series 60/80 phones;
Display the Bluetooth MAC address (Phone must have a built in bluetooth adapter)
(*#res0wallet#) Reset the mobile wallet (Phone must have the mobile wallet feature).If you forgot wallet code for Nokia S60 phone, use this code reset:
Note, your data in the wallet will be erased. Phone will ask you the lock code. Default lock code is: 12345 Press *#3925538# to delete the contents and code of wallet.
Soft-format the memory (Symbian).
Reset to factory defaults, confirmation required (also known has a Hard-format), all phone contents will be wiped clean including contacts and smses if they are stored on the phone.For 6600 users, to format the fone, there's an alternative way. Press and hold <3>, <*>, and the buttons, then power on fone, keep holding on the 3 buttons, till u come to a format screen. tis method ONLY works on 6600, and need not enter the sec code. BUT sec code wun be reset to default 12345.

Some Other Tricks - Set off security alarms in shops
On Nokia phones which support closed user groups go to settings >security settings>user groups and change the group to 500, this will cause most theft detectors in stores to go off, incidentally setting the code to 00000 causes the phone to beep with older speed trap radars.

Nokia Rotate Display - u can rotate display of Nokia 1600, 1200,2310,2600 and any other color and non-multimedia set by applying following codes
*#5513# opposite side
*#5511# left hand side
*#5512# right hand side

*#746025625# Sim clock allowed status.
#pw+1234567890+1# Shows if sim have restrictions.

Unlock service provider: Insert sim, turn phone on and press vol up(arrow keys) for 3 seconds, should say pin code. Press C,then press * message should flash, press * again and 04*pin*pin*pin# \
*#7328748263373738# resets security code.
Default security code is 12345

Change closed caller group (settings >security settings>user groups) to 00000 and ure phone will sound the message tone when you are near a radar speed trap. Setting it to 500 will cause your phone 2 set off security alarms at shop exits, gr8 for practical jokes! (works with some of the
Nokia phones.) 

Learn how to remove virus or some unwanted thing from your mobile phone. Shit happens, or any virus has attacked your mobile, its inevitable u do something wrong, Now what to do you simply have to format your phone. To format the phone, press *#7370#, then enter the lock code, which is the sec code of the phone. NOTE: battery must be filled, else if format is disrupted by low battery, consequences will be disastrous

Press and hold "0" on the main screen to open wap browser.

If you have any other Nokia Secret Codes or tricks please add below in the comment box.

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