Top 20 Secrets of NOKIA Mobile Phones

There are some mentioned Top 20 Secrets of NOKIA Mobile Phones which when typed, provide specific result.
1) *#06#  =  For checking the IMEI (International Mobile Equipment Identity).
2) *#7780#  =  Reset to factory settings.

3) *#67705646#  =  This will clear the LCD display(operator logo).
4) *#0000#  =  To view software version.
5) *#2820#  =  Bluetooth device address.
6) *#746025625#  =  Sim clock allowed status.
7) #pw+1234567890+1#  =  Shows if sim have restrictions.
8) *#170602112302#  =  Shows the SW version ( Nokia 1610 / 1611 ).
9) *#9999#  =  To view Software Version enter ( Nokia 2010 ).
10) *#3810#  =  To view Software Version enter. (Nokia 3810)
11) *#92702689#  =  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)
   4. Displays the date of the last repair - if found (0000)
   5. Shows life timer of phone (time passes since last start)

12) *#3370#  =  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 too slow. Phone battery will drain faster though.
13) *#3370*  =  (EFR) deactivation. Phone will automatically restart. Increase battery life by 30% because phone receives less signal from network.
14) *#4720#  =  Half Rate Codec activation.
15) *#4720*  =  Half Rate Codec deactivation. The phone will automatically restart
16) If you forgot wallet code for Nokia S60 phone, use this code to reset  =  *#7370925538#
(Note, your data in the wallet will be erased. Phone will ask you the lock code. Default lock code is : 12345 ).
17) *#3925538#  =  Delete the contents and code of wallet.
18) To 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# or *#7328748263373738# resets security code. Default security code is 12345
19) *#30#  =  To see a Private Number in case someone is Calling.
20) Free SMS Trick in NOKIA.
 1. Turn your phone off.
 2. Turn it on and enter your pin.
 3. Enter *#746025625#
 4. Now "SIM CLOCK STOP ALLOWED" will be displayed. Now you can send sms for free. If you turn your phone off and later on you have to reenter this code. In some Networks it doesn't work.