*#43# - Used to verify if call waiting is enabled or not *#61# - Verify the number for unanswered calls *3282# - Get your data usage information *729# - Options to make payments. Its operator specific *#62# - Verify the number for call forwarding if no service is available *#67# - Verify the number for call forwarding if phone is busy *#33# - To verify whether barring is enabled or disabled for outgoing *#21# - To display the settings for your call.forwarding *3001#12345#* - Enters Field mode which allows you to access most of the hidden settings and functions of your iPhone *#30# - This shows whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call *#76# - State whether the connected line presentation is enabled or disabled. Similar to the calling line presentation *#06# - Display the IMEI of your iPhone, as always this is the standard code for all brands of phones *225# - Displays the account balance for postpaid