How to view the secret menu in NOKIA mobiles

Before we saw how to enter into the secret menu present in SONY ERICSSON mobiles today let us see about the secret menu present in NOKIA mobiles.To view this secret menu follow the steps given below,

Step:1:Go to main screen.
Step:2:
Type: *#92702689# (*#WAR0ANTY#) NOTE: (0)ZERO not 'o'

NOTE:Suppose if you make any mistake while doing this,you have to continue the process from 1st step you shouldn't press backspace key for correcting the error.

This menu shows the following:
-IMEI number
-Production date (MM/YY)
-Purchase date (MM/YY) You can only enter the date once.
-Date of last repair  if it shows 0000 then no repair is done.