Follow the list of latest Apple codes list:
Code Action
*#06# To display the IMEI Number of the mobile
*225# Use to display the balance detail of postpaid number
*#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
*#646# Use to display the minute detail of postpaid number
*777# Use to display the balance detail of prepaid number
*3001#12345#* Display the iphone inner settings
*#33# To verify whether barring is enabled or disabled for outgoing
*#21# To display the settings for your call forwarding
