 *#06#
It helps to know IMEI Number of any phone i.e. it will work on any smartphone
 *#21#
This code displays insformation about call forwarding (calls , voide and data)
 *#62#
Information call forwarding if phone is switched off or in case of none of service is available
 ##002#
This code disables all call forwarding!
 *#30#
This code allows or blocks the phone number calling you!
 *#31#
Allows you to hide your phone number
 *#33#
This code will give you a list with multiple configurations like ( call , sms , data etc) and show whether they are enabled or not
 *#43#
This code helps to verify status of call waiting like SMS , Data and Sync data
 *#61#
To know missed calls
 *3001#12345#*
If you guys have any more of the codes please let me know by commenting on the post.
