*#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#*
To display many of the inner settings of your Iphone
