Searching Mobile Number Through code

Hello Friends;
Today I am going to share a new tricks with you. If you forgot your mobile number,then you don't worry about it. Just type some codes as given below and press call button from your mobile:-
Vodafone-  *111*2#
Airtel-         *121*9#
Aircel-         *1#
BSNL-           164
Reliance-     *1#
!dea-             *1#
Docomo-       *580#
Uninor-        *555#
MTS- sms NUM send 51230