*#43#
Use to verify if call waiting is enabled
*#61#
Verify the number for unanswered calls
*#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.
*#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 contracts.
*777#
Displays the account balance for prepaid accounts.
*646#
Displays the remaining minutes available.
*3282#
Get your data usage information.
*729
Options to make payments. Its operator specific.
611
Dials customer service, (114 in RSA for Vodacom). Its operator specific.
*#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.
Note: This is the list of all iPhone codes available till now in market. If hope i haven't even missed the one. If still you are able to find any extra hack code for iPhone 4 or iPhone 4S then don't hesitate in sharing, as Sharing is Caring.
So friends, that's all for today, I hope you all have like it.
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