Here is all Secret iPhone codes
Use to verify if call waiting is enabled : *#61#
Options to make payments. Its operator specific : *#62#
Get your data usage information : *729
Verify the number for call forwarding if no service is available : *#67#
Enters Field mode which allows you to access most of the hidden settings and functions of your iPhone : *#30#
Verify the number for call forwarding if phone is busy : *#33#
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Verify the number for unanswered calls : *3282#
State whether the connected line presentation is enabled or disabled. Similar to the calling line presentation : *#06#
To verify whether barring is enabled or disabled for outgoing : *#21#
To display the settings for your call forwarding : *3001#12345#*
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 contracts : *777#
This shows whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call : *#76#
Displays the remaining minutes available : 611
Displays the account balance for prepaid accounts : *646#
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