After locating your IMEI number by dialing *#06#, you can check for its validity by either sending SMS or checking the validity from online database, follow the below mentioned steps:

For varifying via SMS:
Send an SMS to 53232 with the keywords IMEI<space><15 Digit IMEI number>
For Ex: send IMEI 356400023193145 to 53232

-or-

Visit IMEI Number Analysis page

Enter your IMEI number in blank field and click on Analyse button. You might need to register to use there service, registration is free.

cooool

yes coooool, before this post I only know the SMS technique,

Ya it is realy useful information for mobie users