Note: Some of codes will require tapping of call key on your iPhone, actually most of them require call button + tap(means slide it). So if any code doesn't work just by dialing, you just need to tap the call key and it will work. Infact except the IMEI number one hack code all require call + tap.
Secret Hack Codes for iPhone 4 or iPhone 4S
*#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.
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